Navy Lifer
" The things we need to be careful about are just throwing something on the car and thinking it will help, as opposed to properly placing the reinforcements, the size and thickness of material, as well as the consideration of added weight vs all of the above."
I've boxed the frame of every B body I've owned. This does add some weight, but does far more long term good for that weight. In addition to the front brace that changes the sway bar mounting attachments there are two other similarly very low weight/large gain things worth doing.
At the ends of the rear frame rails. Take a 40" piece of 1 1/2 stainless exhaust pipe, put a small bend in the middle to clear the fill pipe, weld on one side at the wide spot at the end of the frame rail, wedge the other side(with a big hammer) into place and weld. Now the frame rails are rigid at the back, similar to the effect of the brace welded to the front. Then add a set of DMR#5029-w rear frame braces. Total weight gain, less than three pounds, very noticable improvement even with a previously boxed frame.
I've posted ALL of this previously, with pictures.
Do all four of these additions and the perception of solidity, improved steering feel and faster steering response, improved roll control and reduced pinion angle shift change the whole car for the better. Even with boxing the frame, everything adds less than 50 pounds.