Historically Pertronix stuff (HEI) runs around 12 distributor degrees(24 crank degrees). There may also be a "54" number stamped on one end of the center cam. At least the last ones I saw lately were done that way.
None of he aftermarket, center cams and weights are heat treated like the factory stuff or the ones I have made here. You want them heat treated. They will not last any reasonable amount of time if they aren't. Take one and drop it on the concrete floor. If it's heat treated it will ring like a crystal glass. If not it simply goes chink and that's it. Those are soft and will cause issues later I promise.
Very possible that the center cam is upside down for its intended application so I would definitely look into it. It will still work obviously, but not like it should and with a limited amount of advance at that.
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