13x7/8's are probably the most common race rim in the world - just about everyone in a 4 cylinder at every oval track in America runs them. I raced in one class that allowed 13x10's...Usually tire heights in slicks are 21-23".
Here's a 'Ghia on 13's:
My old 'mini super' or 'pro-four' Type III rear drums and 13x10's: