1970 GTO the next project

[njsteve]

Did this car have the 400 starter wires running down the tube between the #5 and 7 cylinders? That won’t work with headers. You can use the 455HO/SD455 wire routing which runs across the intake, down the front of the block, behind the power steering pump and along the oil pan rail. It uses a different metal tube to protect the wires on the front of the block. You will need a starter heat shield by the way.