How can I adjust wheelbase?

We are in the process of upgrading the '69 Barracuda with new suspension and brakes all the way around. We installed the rear end components ( new 8.75" w/ Super Stock springs, shackles, big brakes, etc. ), all went in fine and centered nicely in the wheel wells. Got into the front end and replaced everything but the lower control arms ( new heavier torsion bars, upper control arms, all bushings, spindles, and a later model disk brake kit ). Also changed from stock 215/70R14 all the way around to 255/60R15 on 15x8 4.5" backspacing on the rear, and 225/60R15 on 15x7 4.25 backspacing on the front. Now, we have a problem with the right side wheelbase being longer than the left side by about an inch and a half? This is causing us to have contact between the tire and the forward lip of the front fender on that side. The left side looks fine and seems to have enough clearance ( about 2" ) in front of the tire. The exposed threads on the nose of the strut rods are equal side to side, and alignment cams and ride height are adjusted roughly where they should be. Where did we go wrong?