Bent frame????

Hang plumb bobs down the left and right sub frame rails and keep them at the same hanging distance left and right.

Then sight down the plumb bobs from the front of the car comparing left side to right side. If the frame is straight the left and right sides should be hanging the same. If not the same . . bent frame.

Also cross check your unibody from the front lower ball joints to the U bolts at the rear shock plates with a 3/4" tape measure. They should be within 1/4" with a straight frame.