One more thought, if it isn't too late:

Chrome Moly rings rather than Cast Rings.

Sure, Cast Rings break in quicker, but if you ever have the misfortune of overheating your engine Chrome Moly will survive alot better, and the cost is about the same.

'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi