Chevy 502 blocks do not offer
threaded hole for the clutch pivot.
Here is a solution
Scoggin-Dickey - a bracket
that provides a place to mount the pivot.
It does require the removal of 1/2" of
the clutch cross shaft, however.
Electric Fuel Pump &
MSD 8572 Pro Billet
Corvette Tach Drive distributor
MSD 6AL 6420 Ignition Control
with selectable Rev Limiter.