Milling guides works, but imo you have to ask yourself what you want to achieve from the cam/engine? .510 or .590+ lift are two entirely different things and require different things. Lol... So your question should state what you want and what cam might get you there... On that note, I say go BIG or go home... No sense in doing a MILD cam build because like doing rockers, it'll only leave you wanting more!

: )