Have a bent frame. Looking for knowledge on the subject.

You can check if the frame has been straightened properly by getting under the car and doing diagonal measurements to see if it's square. Going just by memory here, I think the factory spec was 1/8" over a distance of 8 feet. Having done this measurement about a hundred times while fitting the back half kit in my Valiant, I can tell you it's a much easier job on a four post lift, and with a helper.