73-76 sliding calipers not sliding?

The springy retainers apply some pressure. I do smear a light coat of anti seize compound on the ways. Anything there will collect brake dust. Bolt it down without the pads and see if a rubber mallet bump will move the caliper. This type of bearing hub setup cant run a rotor so true that it wouldn't bump the outer pad away a few thousandths. So long as the outer pad stays attached to outer caliper, all good.