sbp front disc swap for 73 dart w/ 10" drums

That looks great, man. My car is a 73 though, just to be clear. Will this set up still work? Any other mods beside lower ball joint? And, do I get a lower ball joint for 73 or 72 and down? Alignment needed afterward? Lots of questions, but I want to do this once with no hassles or surprises. Thanks.
You would need to change your "upper control arms to the "small ball joint" 1972 and earlier ones to use my brake set up on your car.
You already have a large ball joint, even though you have a slant 6 car.
And yes, you would also need a 65-72 A body DISC BRAKE lower ball joint.

Seems like your thinking this kind of swap out, but no matter which way you go, it does sorta, kinda, get expensive in the pocket book.