For the cost of rebuilding your existing heads even just to stock, you can get a set of new Ford cast iron GT-40P heads - off the newer 5.0 explorer engines. Either good used junkyard, or you can get them new very reasonably - check ads in Ford & mustang mags. Just as reliable as they are stock (and new, not rebuilt) and a significant power boost without going radical or killing your daily drivebility.
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