Thanks for the input guys.
I was lucky enough to pick up a reproduction 8L Aviad racing sump & an Oil Cooler from a local swap meet a short while ago.
So far the engine spec as follows:
351C block .030
Deburred, Oil return holes enlarged & screw in frost plugs
Milodon 4 bolt main caps, Scat 6" 4130 rods, Probe SRS pistons
Eagle steel crank 3.750
Still on the wish list are - 218 CHI's, Manifold, 830cfm Carb & Solid Roller cam
I am looking for a solid 520+hp @ 6800 rpm max.
I've looked at magazine articles regarding engine grout in circle track, road race cars but haven't found any definitive info on cooling issues etc.
I guess i'll keep looking!!!