The best heads have casting numbers ending with 906 or 062. If you have those, be very happy. choosing a cam depends on what you want from the engine, and your gearing. I know of a Vortec guru who truly knows his stuff, he's Atilla the Fun on
www.thirdgen.org, he seems to be great at speccing cams, noone ever complains, and he claims he was once offered a position on the tech help phones by one of the major cam companies.
If you want to get his input without joining that forum, I could be a go-between.