Wheel tire question for SCCA Solo CAM-T car

I only know the dimensions of the early A's as I got one 20 feet from me in the garage and have been wheel swapping for years looking for the most meat under a stock 8 3/4 track width. Chevy 2 15" Centerlines dual drilled for the SBP is about as close as I can get to the spring without hitting it and I could probably use a 1/2 spacer to get it more centered. The autocross 65 I saw had very well done rear fender lips cut out to match the wheel profile like a Mustang. You could not tell it was custom if you were not familiar with this body style so its possible, but maybe not in your class? That would open the doors to wheel width selection.