Before you go Nuclear on anything, get a can of AeroKroil, pentrating oil spray, and spray a shot on each stud where it comes through the drum. Then gently tap with a hammer on the side of the drum as you pull on it with the other hand. Alternatively use the two bolts in the front of the drum to force it off. Make sure to turn the bolts evenly, say a half a turn each, so you don't get the drum cocked where it binds. Never lost a case yet!

'86 22R Bored .080", Stroked 5.5mm, LC header, Downey 2.25" SS exhaust, 33" SST Coopers, 4W disk brakes, T-Case brake, PRP Seats