DOES THE HDK SUSPENSION K-MEMBER HANDLE BETTER THAN A T-BAR SUSPENSION?
Longer upper ball joints.
And 50 years ago those were not available.
Another issue is longer tie rods to correct bump steer. My brother in law had an 05 Mustang for track days that had those for bumpsteer correction. After 17 years he was in a turn at about 70 MPH when the outside ball joint for the tierod broke. The organizing club does scrutineering on the vehicles and my brother in law regularly checked the steering and brakes. No external cracks were noted prior to the failure.
Moral of the story is, if you use longer ball joints or tierod ends, have them magnaflux tested every couple of years and probably every year after 8 years use.
I helped with chassis setup on a 48 Merc pickup. We held the rack in place with c clamps and then jacked it up and down with no springs to check toe change. This way we could measure and minimize toe change. We had to order spacers for the inner tierod ends to get the pivot point centered along the line between the LCA and UCA pivot points. We yhen double checked bumpsteer before welding the rack mounts in place. This is a street driver so camber gain was not a consideration.
