My project consists of putting a 3500 in an 87 Z24 and upgrading to an OBDII system.
I was told a 96 Beretta with a 3.1 harness will be needed along with several parts from a 3400.
My question is, how much is the same and can be pulled off a 96-99 Achieva 3.1?
I can get that whole car pretty cheap from only 2 miles up the road if it will work.
Anyone know?

I think you'd be better off with something like Megasquirt instead of hodge-podging 20+ year old electronics together.