I have never liked being forced into these little boxes that the government created, I would much prefer to have my 1960 cars with the natural technological improvements that would have taken place over 55 years, just as they did before 1960.
Beyond looks, not much changed in the years before 1960 other than the use of more plastics and the invention of detergent oil. Most of the changes came after 1980, really.
Regarding size, I’ve always preferred small. The smaller the better. I describe my FR-S as a “comfortable go cart” that I can still fit a bass and small cabinet into for rehearsal.
In the 1960’s I was into MG’s and Porsches.