To put it short, I think I am going to swap an 88 TPI 350 drivetrain into an 87 TPI 305 car. Would changing the injectors and CPU out work or would I have to swap the whole engine harness?

Thanks in advance for any help. I would ask/seach on Thirdgen.org but it appears to be down.

 

Not down now.

 

Just grab the CPU from the 88 car and buy a new set of 24# injectors and it should work. Not much sense in reusing injectors that are 16 years old when you can buy new ones for under $250.

Ps. I don't recall if the 88 had the cold start injector, but if it doesn't then you'll have one wire left over that you can leave unplugged.

 

Yes 87 & 88 Have the cold start injector it was in 89 they changed it.

 

No changes in the wiring hardness for the 305 to 350 TPI swap.