There should be a grommet/connector that mates and passes the wire harness through the firewall. Find depictions of the wire harnesses(s) for the engine and lighting on the vendors websites for an idea of what you are looking for. I presume you do not have new wiring as the harnesses come with the connectors.


~ HB
1966 Chevrolet K-10 | Ghost: formerly Flappy Fenders | In the Stovebolt Gallery
1962 Chevrolet C10
1962 Suburban