Suspension, sway bars, wheel&tire upgrades, help!!!

I put it up on the lift already and the car looks pretty good. the front suspension seems to be all new with poly bushings, it has subframe connectors, it has ss rear springs relocated under the frame and 275/60 mickey et streets. Just trying to narrow down why it seems to be pulling or twisting under throttle and then let off to shift, or it is when you shift that it un-twists and pulls. maybe the rear end isn't exactly straight, is it the lack of sway bars, or just need heavier torsions? "Brian" the reason that it was sitting on the bumpstops was because he had the torsion bars cranked all the way down. I adjusted them up and it has more suspension travel and isnt on the bumstops anymore. ride heit is 26 1/2 from floor to c of fender wheel lip. im pretty sure that the inner tie rod ends are going to just be that close to the full length headers. Just Trying to get this figured out? hp is 450 and tq is 510. I wouldn't think that is to much hp to twist it under load with frame connectors?