Engine Code on '87 CRX?

[nomic]

I just got an '87 CRX from a friend for virtually nothing. (She ran the engine dry, and it's been sitting for a year.)

Since I'm going to put a japanese domestic motor in it anyway, I figured I'd drop in something more powerful (like a ZC, D16A1 or a D16A8/9) while I'm at it.

I'm not sure if it's an HF, DX, or Si. I *think* it's a DX with the original engine in it. The car has 138k miles, a new paint job, new clutch, and a bunch of other work that's been put into it right before she let it sit.

My question is, where can I find the engine number? After I wiped off a bunch of gunk on it, I found the letters "PEO-3" right above what looks like the left carb intake, along with the numbers 7, 5, and 11 after that. All of these were right below the head facing forward. The only other numbers I could find were the 4,3,2, and 1 numbers for the spark plugs, and "D4R85-18 7405" on a part in between the distributor cap and the engine proper.

Any other obvious signs that would let me know whether I'm looking at an HF, DX, or Si?

On another note, is $1900 too much for a JDM replacement engine? (That's installed with 2 yr/24k mile warranty and towing and tax included.)

Is it worth dropping a FI motor in a non-FI car if this is indeed a DX carburated engine? I know it would take a new ECU, clutch, flywheel, and wiring harness. I can't really finance a car right now, but I can drop some cash on improvements to this one.

Sorry for being such a noob, but I'm trying to learn.

[shadowboy]

well.. the Si is fuel injected.. so it is most obvious

the DX has a higher redline than the HF (HF is 5500--look at tachometer)
the DX is 12V with 4 aux CVCC valves, the HF is 8V with 4 aux CVCC valves.
the HF has only 1 side-view mirror (driver's side), 2.5mph bumpers, a plastic cam cover, aluminum finned rear drums, and to say the exhaust pipe is a pea shooter would imply that you could actually fit a pea in there

[BSoontirFel]

I too, just baught a 87 crx DX and am looking at droping a D16z6 in it.

as to your Q. A DX has a 12valve carb engin (with a big round air filter on top) the SI has the filter in a box in the bottom left corner of the engin compartment, not to mention you can see the fi rails.shawn decribed the HF well so i wont go there.
my DX has a D15a2 on a engin id plate on the frame near the battery.