S&S 129" Big Bore Kit

At the moment, there isn't anything available to replace the stock cylinder heads, at least, not from any of our suppliers, so I can't comment on that aspect of your question. As for cams, it really depends on what type of power you're after. And we've got a few different grinds from which to choose, but with the big bore kit, you'll probably what to choose a bigger bump to get the most out of it. As an example, the S&S 590C Chain Drive Camshaft Kit would be a perfect match as it's engineered specifically for 124" and larger engines.