PTFB and others make the rear drop links that accept regular front sway bar bushings and retainers. The are also thicker in diameter, and have a poly upper bushing. Good to keep in mind when the originals become weakened or break thru.
http://www.pro-touringf-body.com/Suspension_kits.html
There are 1" rear bars, but believe they were only aftermarket.
Tubular tie rod sleeves are a good idea too, no flex, and don't work themselves loose.
Swear by the 670 boxes.
You can do the Herb Adams VSE front leaf bracket 'anti-squat' mod, costs nothing, and you really feel the difference. You can mod the originals, or buy the UMI or Global West ones:
https://www.youtube.com/watch?time_c...ature=emb_logo
There's a bunch of other stuff, just depends on what you want to do.
EDIT: Subframe connectors....
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
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