[68LSS1]

This is a post from the past. jiggs, I think most (not all) lowering springs these days are progressive rate springs. If they aren't, I wouldn't buy them. As for welding up the seams on the trailing arms I agree with you to a point. I am going to stich weld the seams to strengthen them a little while trying not to make them too solid. Something like a 2 inch weld with a 4 inch gap in between welds. I also, spend time on the Pro-touring forum and if your interested in all around perfromance I know you know of Hotrods to Hell and there truck arm improvement kit. Mine should be welded up within the next months or so. It has a monster panhard bar that is adjustable both for length and height. It has screwjacks to adjust wedge/ride height. There was a recent write up about somene installing the truck arm kit on a Nova or Chevelle, and they were really pleased with the kit.
tubbedII, I think boxing the frame is a good idea but I'm watching the weight. I am going to box about three feet along the engine using 1/8" and probably about the same length on the rear.