s/s springs & front sus?

I've relocated the rear springs on my 72 swinger and installed solid aluminum bushings up front on the s/s springs. I have a pair of stock shocks and the adjustable snubber is off. I've tried running the snubber at all heights and the car does not hook. The best and most consistent 60's has been with the snubber off (1.51 to 1.54). The front of the car has the factory suspension with slant 6 torsion bars. All the bushings were changed a few years back to urethene and there is a set of 90/10 Comp Eng shocks up front. The front suspension height is set to factory (1 5/8"). Oh by the way this is a 340 car. Now since I've relocated the rear springs and the rear works better, I've got the problem of "porpusing". The car will actually lift the left front off the ground twice about 4 to 6 inches. My friends at the track are telling me the front and rear suspension are not working together. One MOPAR racer said to put a little taller tire up front and lower the suspension about 1", this would give me a little more travel. Other racers say its all in the shocks but I've tried adjustables in the rear. I've even checked to make sure that the shocks both front and rear are not bottoming out. Is there anyone out there that can point me in the right direction?