Viper SRT10 rims on a 65 Barracuda?

I've got a second housing that will be shortened for the wheel tubs anyways. I haven't figured out how much to shorten just yet but I'm not too concerned. The axles will also have the 5x5" bolt pattern so I think the rear will work when I'm ready. The thing I'm concerned about is the front. Besides getting the correct bolt pattern in the rotors, what about tire rub on the control arms and the fender? That's really my main concern now

The 18x9's size will fit if the backspace is correct. On the 18x9's with the 5.5" pattern the offset I saw was 25mm, which works out to a backspace of 6". That will leave plenty of room at the suspension, but it will be tight on the fenders. You should be able to run a 255/40/18 and still clear. Assuming of course you can manage a 5x5.5" pattern on your rotor, because there's no room for a spacer.

Other option would be the 18x9" replica's with a 5x115mm pattern, the ones I saw only have a backspace of 18mm though, so it would be even tighter on the fenders. And I don't like the idea of running a true 5x115mm pattern wheel on a 5x114.3 bolt pattern. There's enough difference to cause issues. Maybe not everyday in normal conditions, but its not the same pattern.