On the front, the inside tire will not hit the frame...it will rub the 4-bars or hairpins first. This is unavoidable with these cars, hence the use of steering stops. Deuce Factory has nice stainless king pin locks that double as steering stops.

On the rear, you want at least 1" space from the tire's "bulge" to the body - at the top of the suspension travel. The easiest way to measure is to get the tires without rims and mock them up. Measure from your wheel mounting surface, back to the inside bead. That is your back space.