kinda went through that when i did my body swap... my ecu from my 90' wouldnt work with the 89' donor chassis. after talking with mistu about it, they ran the 2 vins and i found out one was cali, and the other was federal... but that was only part of the problem. allegedly the wiring harnesses (&ecu) are so different between the 2 years it would require alot more than just simply swapping out part of the harness. youd basically be looking at major wiring issues to deal with... far to many to make it worth it. btw, if you do get it to work... youll have to swap in the dizzy that goes with that ecu, or at least a similar one. to get mine up and going again after the experiment, turns out alls i had to do was to use the ecu & dizzy from the donor... and she fired right up.