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I have a very similar setup with the exception of 4V open chamber heads. I run the ford SVO 341 cam (very similar to the crower 15973, next cam up from yours) and make just shy of 400 HP. The cam you have is a very mild one. Crower and some of the crane cams have been recomended to me. The best intake for your motor will be the Blue Thunder dual plane intake. Keep in mind valve clearence and springs when you consider the change.
Rick
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