Wheel size choice and fit

at least a 15..... and if you go 17 with a 4.5 bolt pattern, you can use the
"Bullit" Mustang wheel (keep the cost down) with a B body rear end housing
and i think you might not have to move the springs in(saving labor)...73&up (or RMS) upper control arms and F body spindles and brake stuff..same "Bullit"
wheel should fit on the front (maybe a .25 spacer?) with some sway bars front and rear, you'd have a beginner G car, or whatever they call'em...