I just installed a 95 LT1 into my 96 camaro, I used the 95 harness, Computer and transmission, The problem I had was that the car would not start because the harness is different, I then had to use the 96 harness on the 95 motor with the 96 computer, The car now runs and drive but because the 96 came with the front drive crank trigger, I now have to figure out a way to either put a wheel on the damper or get some kind of signal delete.
I would go with the 96 if you have the engine harness but be careful using different harnesses, You may run into the same problem.
This should help you get started.
http://web.camaross.com/forums/showthread.php?t=474185