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Summit Racing is a good place, generally the best prices unless you happen across a deal on eBay. They have intakes, cams, carbs, headers, and all sorts of other bits for 300's. Not all the small stuff like cam bearings or valve springs are listed in their catalog, but they carry them. Just do a part # search or give them a call. I can actually get some items cheaper from them than I can from my local wholesale house.
Some parts like the "famous" Chevy rocker arm upgrade you can get at your local parts store.
Clifford performance is about the only straight 6 specialty supplier, they have some nice stuff but it's all $$$. They're low volume compared to performance companies like Offenhauser and Headman, so their custom made bits don't come cheap.
Some parts like the "famous" Chevy rocker arm upgrade you can get at your local parts store
Has anyone successfully donethis? Its been going around this sight for at least a few years now? Many people have talked about doing it and what was recquired, but no end results yet.