i'd suspect that changeing rear driven drums over to discs might not be terribly easy. Fair bit of machining and modifications to be done there. Much easier to get a complete disc brake axel and modify that to suit i'd say.

As far as front discs are concerned i havent heard of an easy swap.
Personally i worked through a bloke who'd sort of made up a "kit" (ie: he'd done it plenty of times and new what machining to do and what bits would fit on).

I used 180B struts which also required mod's to the spring mounts and machining to the shock insert.
the late model 180B strut i used allowed any caliper with a 2.5 inch mounting bolt spread. In my case he supplied me with a single piston commodore calipre.
Easy on the parts.
the disc is ventilated and taken from an Audi.
It had to be machined for the correct offset and then he also trued up the match between the stud piece and the disc itself. This eliminated possible issues with the disc being out of true.

Anyway just relating what i was told by The man.
All a bit beyond me at home with no lathe thats for sure.

Good luck, Start saving cash!