Your local speed shop or Mr. Goodwrench dealer has a product called EOS, or GM Engine
Oil Supplement. A container of this to the
oil makes a good assembly and initial fire-up lube. That's all you need on the bearings and rings. Cam assembly lube from Crane, Comp, etc., are all Moly based lubes for cam and valvetrain assembly, and mix with the engine
oil on fire up.