Billet aluminum LS1 Adapter mounts for SBC 350 applications, these are from Street and Performance, and come with flush mount bolts that fit into the recesses in the plate (the bolt heads will not stick out like with other setups)

Bought these a few years back, but got rid of the truck I was going to use them in.

$55 shipped by check/money order, or Google Wallet. I do not accept Paypal.