If I recall, a BFH was my friend. One side freed up nicely, the other was a pain. I put a nut on the end of the stud to protect the stud, and gently but firmly banged away at it. Penetrating oil, heat, and time are your friends, along with the hammer.
Obviously make sure all bolts are removed first. I may have run a thin metal scraper under the seal to make sure it was completely separated.