I'm about to swap a rebuilt '71 460 into my truck, and am trying to figure to what oil/additives I'll run in it. It's bored .030 over, big cam, ported DOVE-C heads, etc... So far, people have said to run 10w-30, 10w-40, 20w-50, and 15w-40 Rotella diesel oil. What should I run?

I have been running 15w-40 Rotella in my current '73 460 which is not built to make as much power. The diesel oil has more zinc in it so I didn't feel the need for zinc additive.

Also, I know with the new standard oil, I know I'll be running a zinc additive. Any recommendation on brand? Comp?

Thanks in advance!