I would also talk to Clay Smith. http://claysmithcams.com/
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P.S. Herbert lists solid roller lifters as a direct drop in, no mods required. With modern valvetrain components you could run the solid or solid roller on the street and just check the lash at oil changes...it should not change very much, if any. http://www.dougherbert.com/rollerlifters-p-10099.html?cPath=83_93_683