I think it would be a big help for you to tell us what your drive train is and what you want to do with the car. I have a stock suspension on my 64 GTO. It has a nitrous-assisted 428 with a 4 spd and a 4.33 posi. It ran 10.80 with 9 slicks. The main thing you need to worry about is strength and minimizing flex. I have after market lower control arms, although you could box the ones you have. I have the front support that ties the front mounting points from the upper control arm to the lower control arm together. I also reinforced this piece so it would not go out of round or break. I had small plates welded onto the K member where the uppers bolt on. They fit into a recess, and that part tries to pull away from the main member which can result in cracking it. I welded the bushings into the upper arms, as I had one tear out once. I also run air bags in the coil springs, with the right one set higher than the left one. I have not tried the no hop bars, or any other altering of the factory instant center. The car could hook better, but this works pretty well.
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Jim
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