Wheel Size Question.

Kind of doing it in reverse order. You need to make your mods first. Obviously you will not be using the stock brakes front or rear so the bolt pattern is moot. It will now be the standard pattern. 5 on 4 1/2. so wheels selection will be unlimited. Cragar S/S is not a performance wheel. Maybe in the sixties/seventies but that was before radial tires and ultra low profile tire were made. The suspension is a combination of the control arms, shocks, tires, wheels etc... You need to plan out the total combination from the start.
Like buying a cam and not knowing what induction, exhaust gearing, weight etc...you are building for.