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It is a huge undertaking to maintain a solid lifter cam. Especially if your a part time driver/streeter cruiser type. If so then go roller or hyd. Solids take time to set up and for the most part you have to inspect!
I run an Ultradyne .577 solid in my 440/498 stroker. Had I built this engine I would had gone roller but the power now is tremendous and scary fast. Not many "cams" have it as solids do..
go see a few old school builders and ask away!
Im stuck with what I have for now but I tell you, this cam is crazy! set up right you can get huge power...

I just don't get it,my Ultradyne solid cam has never needed any real effort,just don't assume all valve springs are the same,just because they have similar numbers doesn't mean good valvetrain life.I wouldn't put a .557 mopar in anything,unless it had shag carpet.The last Mp .557 cam was a dog when 2 other cams were run against it at the track,maybe MP ground me a dud?