OK, my mount/cross member situation is a little different then most but I will share it just the same. I modified the original mounts and attached them to a 2X2 cross member. This is bolted to the outside of the frame for drop-down engine removal. Using the F-body pan the 2X2 sits with it's bottom edge 1/4" below the pan. Of course this system isn't gonna work for front engine mount, but for mid engine it's the ticket.
Exhaust clearance issues?....hahaha! I laugh at exhaust clearance issues.
Rob