Uh, Dillon, maybe?
1-800-762-3845
I don't recall the conversion being a catalog item in Blue Press anymore, but if you called them up, I am sure they would tell you if they still offered it.
I don't know if it would be economically feasible. I would get the automatic primer feed and powder measure if your version of 450 lacked them, but I think I could unscrew a lot of dies for the price of a new frame with detachable head.
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