[Cracker]

The easiest way to determine if it is a Nascar rotating assembly is
to check the rods & crank. These use wider rod bearings and are visually different (wider) than standard lemans.

Just a note concerning all older stuff. It was the best they had back in 65-67 but is inferior to standard racing equipment today.
It might be neat to say you run "Nascar" crank & Rods but other than that I wouldn't trust 37 year old equipment to hight rpm duty. This is not my opinion but that of the head of Shelby's own engine shop - Mike LeFevers. I mentioned I had a line a year ago on the same stuff available here - Brand new SO block, NASCAR rods & crank, etc. He said run it if you get the crank & rods for under $700 - other than that he wouldn't run the risk. Now my engine runs JE Pistons & Forged H-Beam Eagle rods. Hope it helps.

Cracker