Straight swap but the 68 rear will be 1 inch wider on each side (a total of 2 inches wider)all 64-67 were one width and 68-72's were the wider ones.(although the 68-72 rears are not as rare as the 64-67's) With the width difference you will probably need to get either custom rallyes(wheel vintiques) or custom mags(cragar, weld, centerline etc) with custom backspacing. For instance if you want a 15x8 rallye instead of getting 4.5 inches of backspace you will need to get 5.5 inches to make up the difference for the width of the rear.
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