I recently bought some motor mounts from Chassis Engineering. I'm using them on the frame to mount a late model engine.
http://www.chassisengineeringinc.com...6-cylinder-19/
They also have LS mounts.
http://www.chassisengineeringinc.com...engine-mounts/
I'm betting you could come up with some sort of combination between the two with a rubber mount between them.