I have a 89 Camaro IROC Z that was a 350 TPI car. The previous owner hacked the wiring bad. I have a full engine harness from a 87 305 TPI car. Can I use this harness with the 89 computer on a 350? Will I have to make any changes to it? Thanks for all of the help.

 

They should be exactly the same compare the colors of the wires going to the ECM they should match. If the harness was repinned to Speed density its going to be a nightmare to compare them.....For the most part the harness the same.