the early 70-73 wheels are slightly different than the later Z wheels, just a slight difference in the lip of the outer wheel. Functionally the same, but IMO I would leave them to the 71-72s, I just dont think they look right on the earlier models. A friend put them on his 70ss years ago and they just didnt look right! I would stick with the 69 SS wheels or go aftermarket.
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Dave (NY)
70 chevelle ss396 conv
66 chevelle ss396 hdp/conv
72 chevelle
55 chevy prostreet
69/71 camaros
61 impala bubbletop
TC member #493