How to remove wheel studs that are rusted?

I've purchased a complete rear end for my 95 isuzu pickup from a junk yard. I needed the new rear end because my current one has a lower gear ratio and was intended for a larger 4-wheel drive engine/. Because of the gear ratio when I'm driving down the road at 55-60mph I'm cruising at over 3000rpms. When hitting 70 the engine screams. I need to put the original size rear end back in to keep from burning out my engine/. I'm going to replace everything that deals with the breaks inside the drum and have the drum itself resurfaced. Before all that I had the rear end sandblasted to get the rust off but unfortunately all they had was semi course sand and with the rust already eating the studs away needless to say they aren't worth salvaging so I'm replacing them all. Problem is they are cured to the axle from the rust. I've tried spraying them down with spray and letting them sit overnight as well as using a propane torch. None of the studs have even slightly moved. Unfortunately I don't have nor know of anyone who has an acetylene torch either. Any ideas would be grateful.