David,
These mounts which are steel coated with rubber do deteriorate over time making removal difficult. The BFH is a solution I have used in parting many similar trucks. If you are going to replace the mounts which I recommend, then cut or get a side of the mount knocked out of the way or completely removed. Often times the bolts you describe have worked a bit and the threads get damaged. If you get the bolt removed from the crossmember you can the use a jack to raise the engine/trans carefully to help take the pressure off the mount/bolt.
