Power brake conversion questions ('70 Dart Swinger)

Power booster kits on ebay used to be based on GM parts, I think, because the booster had a threaded rod to which they installed a Mopar adapter. But, the one you linked looks designed just for Mopar. The MC (bulgy) looks like one for GM, though I am no Chevy expert. Anyway, should be simple and should work. They didn't have those when I put power brakes on my 65 Dart, at least not affordably, so I re-purposed a booster MC from a 95 Breeze which I put on 74 Dart brackets. Also installed an adjustable prop valve (for future disks). The brake kit you linked shows pads. That might not be what you would get since front disks were fairly rare thru 1972 (Kelsey-Hayes & parts are hard to source today). I think you could get better prices by piecing together yourself on rockauto.