Bought these for my 72 Camaro swap, wont be using them. They are the 1" setback stock sbc location mounts. The front corners had to be ground down slightly to clear the front edge and make it fit flush to the block.(Common Problem) These will allow you to use your stock SBC mounts and clamshells. Transdapt #4575. Comes in the box with hardware, instructions sheet, etc.
$55.00 shipped

http://www.jegs.com/i/Trans+Dapt/969/4575/10002/-1