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Ramcharger had a great explanation of the basics you need to know. I'd like to add on thing. When you ask if you need to lean down the carb if using bigger jets I am thinking maybe you are referring to leaning the mixture down with the idle mixture screws. If that's the case understand that...

There is a company on eBay that has the 318 "302 swirl port" heads for $155.00 a piece. They come complete with a 3 angle valve job, new springs, valves, guides and seals. Shipping is only $25 bucks each. Here's the link...