F-body mounts for the LS. They mount to the block and the adaptors mount to the frame. This worked out for me because I notched the frame for the lower SD5 A/C compressor to tuck tight at the bottom with the Alan Grove compressor mount.
http://www.alangrovecomponents.com/LS.htm
If I did the Small block mounts and adaptors they would sit forward more on the frame(I guess or unless I made my own), but he Spohn mounts worked great and are beefy.
http://www.spohn.net/shop/1978-1987-...Clamshell.html
http://www.spohn.net/shop/1978-1987-...ng-Stands.html