Reply to "Pantera 06927"

Factory bump-steer rack spacers were stock on some '73 and most '74 Panteras, and I presume- later models too. They're shown in the '75 and later Illustrated Parts Lists. Note the bump steer will be different for every car on the road; the ideal amount of correction can be found only by experimentation, but most of it is removed with a 0.312" lowering of the rack body. There are other ways to get the same effect, too.
Early Hall sphere balls used regular hex-head bolts to hold the assemblies to the a-arm mounts, and those bolt heads got VERY close to the spinning u-joint ends on bumpy roads. A simple fix was to substitute flat-head allen bolts, countersunk into the aluminum top plates. Those now sold by other vendors (and maybe Hall, by this time) include countersunk bolts, so no clearance problems anymore. The earlier assemblies were bonded together but in later ones, the plastic balls are replaceable. So if you buy late assemblies, then decide to change swaybar sizes, you can just get the balls, saving you from extra expense for complete new assemblies or trying to machine out the balls.
If you really want to delve deeper into the handling possibilities of the Pantera, I did a 5-part series a few years ago in the POCA Newsletters, describing what's possible. Too long & too detailed for e-mail posts. By the way, I try all this stuff out on my wife's '72 for many miles & various speeds up to 150 before recommending anything as serious as steering mods.