68 camaro wheel & tires sizes??

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I am looking at putting 17's on the front & 18's on the rear I have stock suspension with drums on the rear ( except the rear end is from a 70 camaro) any suggestions on offset as well as tire size?? -Thanks

[Black67SS]

That rear end should be 3/4 " shorter than the stock 68' rear end.So adjust back space from all normal recommendations to provide for this.My 67' has the same setup.My 275/60 15's on 8.5 wheel with 5" BS rub a little on the inside but my 275/40 18's on 8.5 wheel clear plenty as the sidewall is not puffed out like on the 15's.

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Thanks