Disc conversion question

Depends on "what drums" and "what car". I BELIEVE that the 73/ later cars which were drum, IF they were the larger 10" drums, can use the same UCA. "Generally" drum to disc, you must use disk UCA

You should not need LCA nor tie rod ends. Consider carrefully whether to put the spindles on with the calipers to the front (OEM) or rear (maybe better). Depending on anti sway bar or aftermarket, you may want them to the rear. Swap calipers side for side so the bleeders are on top. Generally I've hear you can use some Camaro hoses, but I and others used Volare front hoses