Need help with 1964 Dart rear wheel fitment

Hello members my name is Kim and I'm from Mooresville North Carolina. I just purchased a 1964 Dodge Dart GT that I want to fix up. I'm looking at putting some 15" Cragar SS wheels on it. I'm looking at the 61C wheels from Jegs, 15 x 6 for the front and was wondering if a 15 x 8 with 4 1/4 back spacing will fit. If that is too wide I will go with the 15 x 7.
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Cragar 61C5854
Part Number: 260-61C5854


Cragar 61C S/S Direct Drill Chrome Wheel Size: 15" x 8"

61C S/S Direct Drill Chrome Wheel

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