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Reply to "Forgeline Wheel Fitment for stock '72"

The link says Marty's wheels were 18" x 8" and 18" x 12", which I think is a bit more realistic. Fronts will still rub on the inner fender at full lock and I think any more than 6" backspace on the rear and you risk clearance issues, although that may not be as big a concern at 18" dia. Personally I'd go 17" front and 18" rear to ad some visual rake.

If you jack the hub into normal ride height position and measure from the mounting face of the hub in conjunction with a level on the fender lip you should get close on determining the front spacing

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