We did a 57 chev with 335 30/18 and the differance in the overall look of the wheel tire combo is dramatic the 20" just loos soooo much bigger.
and we all know bigger is better. we are also building a 67 chev P/U and have a set of the Mickey Thompson 18.5/29/20 radials on order for that one 18.5 WIDE!!!!