[Sam Bozzette]

As you have found, the body is not equal on both sides and as you get to positioning it you will notice other minor inconsistencies from side to side. So to save you a bunch of rework on side pipes, bumpers, brackets, etc. I suggest temporarily positioning the body on the frame first. When you are satisfied with the positioning drill a 1/8" alignment hole through the body into the frame in each corner and drop a #12 nail in each to keep it in position. Then you will be able to fabricate brackets and other needed pieces to make the car appear as symmetrical as possible.

Good luck, Sam