64 Valiant Engine Wiring Harness

Both. It needs to be compatible with a '64 Valiant, and a V8.
Like Rusty said, one for a 273 will work fine.
Some vendors can modify their harnesses- for instance, if your 360 has electronic ignition, or later model alternator and electronic voltage regulator.
But first, figure out why the harness/engine burned up...
I sure wish I could tell why it burned up. The carburetor is gone too so I'm thinking it had something to do with that. I figured we'll start with the wiring harness and go from there. I tried reaching out to the owner who had the car when it caught on fire, hopefully he knows. Thanks for the advice!!! Can you tell I'm excited to start on this project?