ive searched and cant seem to find the answers i seek

build in progress... 97 Z, 383 lt1, deleted all ac,heat,ps,abs. planning on log manifold single turbo kit also.trick flow heads, keeping fuel injection.still dont know what to do for a tranny.

i want to get a whole new computer system and wiring harness. i was looking at holley commander or accel dfi.

i would like to use my instrument cluster, but as far as headlights and such go, i can figure out how to wire them.

will i have to keep a portion of my old wiring harness and pcm for the instrument panel?

has anyone done an aftermarket wiring harness? problems?

thank you for your time and suggestions