[The ORIG. Dig. Oxy]

What the Muscle dude said about the computer/carb is right on.

If you go with a FI 302 or 351, you will have to change wiring harnesses, computer(s), etc. It will not be an easy thing to do, it is it doable.

Now, the Carb version would be a lot easier to do.

The tranny may or may not hold the power. Since we don't know whether you have a slushbox or a M2R5....

It is said that the Slushbox will not take as much torque as the M2R5, but I have seen both break.
If you have to ask "how much goes into an engine chage", then you really should not do it, unless you have a bit of mechanical aptitude, and TOOLS. Lots of TOOLS.

Go buy yourself a $20 code scanner. It will tell you why the "Check Engine" light is on. If it is one of your O2 Sensors, you really dont want to drive on it too much. Be proactive about your car's well being, not dumbactive.