I used a Reliance kit for a 404 JD, I did a thorough job and also put in a cam and lifter kit from Reliance. I was very disappointed to learn I was sent a defective camshaft and would have to remove and reinstall a different one. I got the impression that Reliance knew approximately 33 percent of the cams would not work and it would be easier for Reliance to deal with the defect after the cam was installed and found to be bad than to get ahead of the problem before they were installed. The oil pump drive gear was ground without regard to engine timing, oil pump drives injection pump. Reliance replaced the cam and gave me $300 for my trouble. A Reliance overhaul kit is only as good as the components they buy from a low cost provider and providers likely to change whenever Reliance chooses. I guess it's a crap shoot.