80Abody,
A great place to start would to be checking out Joe Hinds book - GM G-body Performance Upgrades 1978-1988.
I also have been swapping a 6.0L in a 82 Regal, helped with a 4.8 in a Elky, and a Mast 440 in the LSX ELCamino, all of which used the BRP motor mounts... we have used other parts...