Rebuilding front and rear suspension

what about if you have a '73-76 A with 4 wheel drums/SBP like I do? do I still need new UCA's, or just spindles for discs?

if you're doing a "factory parts swap", verify that you have the large upper ball joint UCA and then just get spindles from 73~76 or from a F/M/J and then the brake bits you want to run.

if you don't have the bigger upper, then you'll need UCA's

if it's aftermarket, somebody makes a kit that bolts to whatever it is that you've got.