@DannyP posted:Eric, you may want to investigate these Avons, specifically 175/70R15. They are VERY sticky, and will wear pretty quick. And they are pricey, but certainly offer "the look" of period-correctness.
I think Marty ran these for a while:
if money is not of concern, Avons are the pinacle; classic side wall you can run on them street and on the track. They are soft, so not a good idea for folks that don't have a paved driveway.