Air shock options

15 x 10s fit into most of the short wb cars, given the right offset and with the springs moved in a bit with the offset hangers. 1/8 is a little tight to the springs but works. To the inner wall you need about a half inch if you like torquing around the turns. .25 is too tight, except in a straight line. .375 is OK if you drive reasonably nice. This assumes that your springs have very little arch and all your bushings are tight, and your shackles are original or boxed.
I ordered my Wheel Vintiques with a tad too much backspace so I could fine-tune final fitment with spacers. After I knew exactly what BS I needed, I had the spiders moved. I can now run 325/50-15s , but no torquing in the corners. (68 Barracuda, factory tubs). IIRC those are 13.5 cross-section by 27and change tall. I did roll the outter lips a tad, because my car is pretty low.