When I first started racing my 1963 Plymouth Belvedere two door sedan 415 HP M.W. in NHRA A/SA stock class I ran a old set of Firestone 820x15 bias plys drag race front tires, they where 31.0 inches tall I may have had to raise the torsion bars up a little, if I did it wasn't much I ended up drag racing two of those cars, one 1963 Belvedere hard top Pro bracket car and the stocker sedan, I ran the 31 inch tall as long as I could, they where weather checked pretty bad when I got them, bad enough that I had to run tubes in them. I ran 29 inch tall Moroso front runners tubeless on the bracket car