Are the bolts rusted? Are the bolt heads in good condition or chewed up? I take it both the engine and transmission are in place?
My first thought is to get the most snug-fitting socket you can and use an impact. If they're cross-threaded all the way down (I used to work with a guy who did that kind of crap), the impact is the best chance of getting them out intact. Don't try to hammer them out in one long go, back them out a hair, tap them back down, take them out further, etc. until they come out.
That said, you're saying "torque converter bolts", and I'm wondering how to get an impact gun straight on them. A wobble socket is asking to break either the bolt or your knuckles. My second option would be to spray as much PB Blaster/Kroil/hydro-diesel mix I could on the bolts and use a boxed-end wrench double-wrenched. I'd say to use a cheater pipe, but it's too easy for the wrench to slip sideways in the pipe.
