Ive posted this elsewhere on the ubb but ill put a copy up here.
Im putting s-10 4.3 tbi engine and 700R4 tranny into my 89 bird with the 2.8 and dying 700R4. Ive got the computer for it and I need to buy a wiring harness. what kinda issues will I be running into and is the anything I should do other the label parts before I putt the 2.8?
~Jeff

 

Im pretty sure that the 4.3 uses v8 motor mounts. How hard is it to put the 2.8 intake manifold and injection crap onto the 4.3 and do I need to reprogram the computer? or can I use the 4.3 tbi computer?
~Jeff

 

The 4.3 is basically a 350 with the two cylinders removed.

You cant put the mpfi intake on the 4.3 the 4.3 is a 90* V6 and the 2.8 is a 60*

 

Hey- I've done a 4.3L swap into a 2.8L S-10 if it helps at all...
Not too sure about the mounts, the engine might end up too far forward (ie-trans also, driveshaft mods, etc). Then again maybe not, might as well try it first to see. If not, your best bet would just be to weld up a custom set- ideally you want your trans to be exactly where it would be in a V8 car. Electrically, you should be able to use an L03 or L05 harness and ECM- I would use a 1227747 ECM, just because they're super common and easy to hack or a 1228062 because those are the most common 4.3L ECm as far as I know. Do yourself a favor and get the REAL (GM/Helm) service manuals and wiring diagrams and just go by those. It will take awhile, but just go thru and make sure everything is straight & you'll be good to go the 1st time around. Well good luck & keep us posted on the progress

I always wondered when someone would do a 4.3L swap into an f-body...

 

ive been thinking (and my engine is sagging from the car cauz I havent had time to fully pull it yet), should I bolt up the new tranny first so I can use the original driveshaft or is that a bad idea? also with the wiring, will the headlights still work from a wiring harness from another car (lets say either a monte or caprice)?
~Jeff

 

the lower motor mounts will have to be moved reward