Re: How much wiring to start engine?
You will have to use both the engine and lighting front harness. The power to the HEI and and the starter (neutral switch) and fuse bock come from the lighting harness. You will have to have the alt wired (so you do not have a live 12V wire out there), horn relay, and regulator also. That should do it to start it up and break in your new motor. Good Luck Jerry
68 Red with Red & white interior, 383, Offenhauser Crossram, 700R4, Ocala FL