Biggest rear tire in a 68 Dart?

Thanks, that does help. I guess I will just have to do some careful measuring, because I have gotten a wide variety of opinions on what will fit in the stock wheelwells. as far as clearance, I have run 295's on a Dakota with only 1/4 of clearance to the leafs, I never had a problem with clearance, because the leafs dont shift much in relation to the axle, I am more concerned with the clearance to the body. If at all possible, I want to run 275/50R15 Nitto Drag radials on the back, I was thinking of 225/60R15 on the front.

The car is being trailered here Saturday afternoon, so I can't check until then. Currently the tires are very dryrotted and cracked, so I want to replace them asap so I can drive the car.