1971 Duster Handeling

I will get the actual alignment specs as I did not do it myself of of course. When i put competition springs and big rear tires it raised rear of car and i raised the front up to compensate so I'm sure this is all compounding the problem. Does anyone have any suggestions on good tires I can get that would be rated for that speed and would fit on stock Rims? And do you think this is much difference between a tall one from randy and the DC spoiler? I imagine the DC spoiler would work better since it is mounted to bumper. Also with the DC I should still probably look at lowering the car if I can at all correct? How high do you have your car off the ground from the bottom of the front spoiler?

what's the rear tire size and rim size?

sounds like front end is catching a bunch of air and raising car in front those speeds

again do you have stock size front torsion bars?