Joining to pick your brain

Welcome. I am hardly the expert, but I recall that 63-66 have narrower rear ends. If so, maybe one can compensate by getting wheels with a matching offset. As mentioned, many posts on FABO on rear end swaps, so search. I kind of recall people looking for 8-1/4 or 8-3/4 rears pre-67, but they will be SBP.