My wife and I recently purchased a pretty solid '55 Plymouth Plaza Suburban. It's a flathead six, three-speed manual column shift. The wiring harness is a rat's nest of splices, electrical tape, and cheap wiring terminals. Rather than try to fix that mess, I've ordered an American Autowire harness and a 12V conversion kit. It runs like a top. I'd forgotten how smooth straight sixes are. Looking forward to getting into this one and having it for cruise ins and car shows next year.