Upper Control Arm bolt

It's disconnected from spindle.
I don't have a "real" torch, just a propane one. I've held the flame to it for long periods of time and beat on it while applying heat. I guess I'll just keep going at it that way. I've had some stubborn rust welded nuts and bolts in the past, but this is ridiculous. I might try getting my angle grinder in there with a cutting wheel..If nothing else, maybe cut in enough in a few places to weaken it.
Does the bolt turn within the bushing? If so, I would put an air ratchet on the bolt and simultaneously take your 2lb sledge and bang away. If you need a second person, I'm in the area.