Dave I just might try that, nothing set in stone yet. Input appreciated.

I put another of what I believed to be a .474 cam in it and checked it out. I come up with 285 at .006, .4755 on the intake and .473 on the exhaust. 'On the dots" (which yes I do understand doesn't mean anything by itself) came up at 105 intake centerline, 115 exhaust centerline for a lobe separation of 110. Duration at .050 measured 234. So to me, that one is indeed a .474 and it's in 5 degrees advanced (or has "advance ground into the cam" much as I don't like putting it that way, it is misleading), I would probably just run it like that if I decide to use it.

The mystery 1 bolt 283-498 cam will probably have to stay that way I guess. I might double check my readings on the intake and take a few minutes and look at the exhaust just for info, it would help to know lsa....but not really knowing what the heck it is, probably won't use that one! A guy here on Moparts gave it to me during the '90s and he did not know what it was either