I have a real nice 1983 S-10 Tahoe V6 4X4 longbed that I got for FREE because of the dreaded knocking engine syndrome. I also bought a very nice running MultiPort FI V6 engine from a 1990 Firebird. I got the entire wiring harness & the ECM, too, all for $100!!
Digging into the paperwork that came with the truck, I find that a "Target 2.8" engine was installed 10 years & 20,000 miles ago. Checking this out reveals that it has the onepiece rear main seal & the full moulded one piece oil pan gasket. It still has the fuel pump on the block, though. The entire assembly looked like a stock carb equipped 1983 vintage engine compartment with a 1995 longblock installed. A real nightmare of emissions hodge-podge! Pulling the oil pan reveals a trashed rod journal along with plenty of shrapnel in the bottom of the pan that used to be a bearing shell.
I'd like to put this Firebird MPFI engine in there, but I need to keep the original S-10 front pulley arrangement to run the power Steering & A/C compressor.
Any Sage advice on going down this path?
If I change the front timing chain cover to the earlier style with the standard belts & pulleys, can I then bolt all the brackets for the PS & A/C systems back in place?
What fuel pump would connect up to the existing lines to give me enough pressure to run the FI system? Where should I cut a hole to run the ECM harness through the firewall?
Looks like I can install the oil pump, pickup & 4X4 pan directly onto the forner Firebird engine.
The only exhaust manifolds I've got are the ones from the 1983 setup. Can I plug the holes from the air pump setup then add an O2 sensor to one of these manifolds? Or should I add the O2 sensor down on one of the header pipes?
Anyone have a diagram for all the vacuum lines of the MPFI engine?
When I finally get there, what about an air cleaner? The Firbird engine did not come with any of those parts. I'd like to plumb in some kind of cold air intake setup.
I know this sounds like a lot of work, but this truck is really worth it. It's been well maintained with only 144,000 miles total on the truck, No rust, fully loaded with options, & has a nice white Gem Top steel canopy with side window hatches. Two tone Sunshine Yellow with White below.
Thanks for any help with this project, guys.

Dan - Seattle

They sugest using the newer Serpentine system on your new motor. You might want to look at 87 or newer 2.8L S10's for one that'll keep most of your accessories in the same place.

Use an electric fuel pump close to the tank.

I would use your carburated manifold, or even go aftermarket. Run the stock vaccum system, or even get rid of the polution control stuff if you can and run a basic setup (less future leaks and easy to find then)

I don't think that it sounds like too much work, and several of us have done more to our rigs.

Since I already have the A/C & Power Steering systems with existing pulleys, and I'm not keen on replacing the perfectly good A/C compressor & the expensive Freon, I am going to put the front end components from the Target 2.8 engine onto the Firebird 2.8.
I see no reason to use the old school carb setup when I have a great MPFI setup already installed on the engine. I need only to plumb in the fuel pump & wire up the various sensors and figure out the vacuum lines & an air cleaner system. There is sure a lot of wiring on that stock harness, though! I will have to pass emissions here for at least another couple of years.
I feel pretty good about making this into a great running little truck that will get decent mileage. My daily driver now is a Buick 3800 V6 - It gets over 30 mpg on the highway. I don't expect that from my S-10, but it sure is a sharp looking little 4X4 rig.
Any suggestion on the brand and model of fuel pump I should get to work with the fuel injection system?

Dan

Do yourself a favor then, and just take the complete fuel injection system (including the in tank fuel pump) from an S10 that's already fuel injected.
It's the only way that you can reasonably make this work without going broke.

If that parts truck has a 2.8" with the accessory bracket brackets you seriously might just want to grab them. Your motor has a few things different on the front including your water pump spins the other way, and the new brackets will probably be a perfect match for everything.

If you decide to stick to carburated (when you find out how big the job actually is) you'll be happy to know that most intake manifolds are either 49 or 50 state legal, and will pass the pollution inspections. As long as their tuned up, and going on an S10 that left the factory with a carburator.