how to get out rusted up bolts

[lovemychevy]

hello having to change my hub on my 98 and the three bolts are rusted to the hub and cant get it out. i mean really rusted like nothin i ever seen cant see no rust built up around head but they are stuck ive tried all i know heated them put a hammer and chisel on them (theyre already rounded) and put a pipe wrench on them soaking them in gear oil tonight and gonna try again tomorrow but would also like some sugestions and how good do you think it would do to drill them out with some left handed bits???????