I've been rebuilding a 1971 CL450 and my cam lobes are on the low end of the tolerance given in the Clymer manual. Is the manual accurate and if so is there any way to get decent replacement cams? Ebay has a few sets for sale but they never have any specs on them and a lot of them look like they're even more worn than mine. If I can't get replacements is there any way to get mine rebuilt?