I've had mine for years, they were made by CAP as were the UCA's. The advantage is the Heim joints, with the torsion bars and shocks out, I can move the suspension by hand through it's full travel. There is no binding, it's just one easy and smooth movement, pretty sure this helps with weight transfer. They are adjustable as is the UCA's.

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'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03