68 kframe vs. 73 & up
I think the '73 and up K frame design is better than the '72 and earlier design. Having said that, I'm in the process of removing a '73 K frame from a 1968 Valiant and installing a re-worked '72 K-frame. Only reason we're doing that is to gain more room for the oil pan. The steering linkage will stay '73 style because it is better. The steering knuckles are from a FMJ, anti-sway bar will be custom to work with the '73 lower control arms.
Some of this stuff gets confusing! Have to have a scorecard to keep it straight.