DOES THE HDK SUSPENSION K-MEMBER HANDLE BETTER THAN A T-BAR SUSPENSION?

Randy was running in about 74, so the aftermarket parts were not available like now. I think he put a big block anti roll bar on but still had a fair bit of body roll mid corner. The only way to get camber gain would have been to do a Shelby style UCA relocation 1" lower, like was done on the Shelby Mustangs. Much more difficult on the A body Mopar vehicles.
This is simple actually. Hence the taller spindle and ball joint.