biggest tire that can fit in minitubbed a-body?

you say nothing rubs...is it a track only car, or do you drive it on the street too? I wont be going SS springs, so im not too sure if i can go with a 29 inch tall tire, but i'll have to measure all that...13.5 section width sounds about righ as to what can fit underneath i think....anybody else out there want to share their combo?