15 inch Wheels and Tires on a 64 Barracuda?

Bob Watkins said

I think I'll go with the larger 5 bolt 4 1/2" pattern since most of the new wheels use that.

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Then you might consider an 8 1/4 rear. Rear discs are a bolt on from a jeep, as they use the same style rear. The fronts are the standard later Chrysler conversion. Swap over to the dual line master cylinder and brake lines also.