I have an 89 Camaro IROC Z 350 TBI and I have a 94 Caprice LT1 engine, and I wanted to know what wiring harness I can use for the swap. I've seen some on Summit and Jegs but I'm not sure which one to get can anyone help me out much appreciated thank you.

Welcome aboard thirdgen.org.

I moved this to the LTX and LSX Engine Swap subforum.

May we assume from your username that you live in California?