Richard Douthit, San Francisco, CA, 1965 Plymouth Barracuda 5.7 Hemi Swap

Thank you for all of your varied advice over the years. I have a question for you that is both very simple yet complex: I am installing frame connectors (2" x 2" square tubing butting into steel plates on the tranny crossmember) and before I weld anything I want to make sure how precisely square everything must be.

The car is a stripped unibody (except suspension) on raised jackstands resting on the lower control arms in front and just inside the drums on the diff housing in the rear. I have got it sitting as level as I can, mimicking its weight on stock suspension.

When I place a 4ft level under the front frame members it seems about a 1/2" out of level (left to right) yet the rear frame rails are level. Same goes if I then level the front...the rear frame rails go out a similar amount. The car is a slant six car so no big block twisting has ever happened, and it's never been hit. However, I don't want to unify the frame crooked. How "out" is out in this upgrade? Of all the articles I've read, the only mention is to check the doors but I haven't seen anyone check the plumb from the bottom of the car (unless it's welded to a chassis table). Is this a normal problem and/or is there a standard solution?

Also have you any photos of an early A Body (or any A) with aftermarket torque boxes installed? I have never seen a set in person so I likewise do not want to weld these incorrectly. The manufacturer gives some rather vague diagrams and grainy pictures for this upgrade...

Thank you for your time,