I have 15"x7" w/4" backspace with 225/75/15 tires on one of my '57 150s. Plenty of clearance front and back. I used '70s original 15" GM wheels. My comments after looking at the Summitt wheels (1) I do not like the dual (10 holes) lug patterns (2) what, if any, hub caps do you intend to use? Original full wheel covers will not fit 15" wheels and, if the Summitt photo is a true representation of the wheel, it does hot have the nubs for the small or dog dish hub caps and will not fit.
I'm not sure what you are trying to accomplish. I just went through this wheel business looking for wheels to clear the rotors for disc brakes. I ended up doing 14 X 6 rally wheels. I was able to keep my white wall tires. I really don't like the 10 hole wheels.
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