IIRC, the bearing spacers for the SBC cranks were an over-the-counter part after years of racers like Bill Jenkins stacking their own to get the same result. No reason why it shouldn't work in my mind for a BBM; it's simply not something that anyone ever bothered to produce for the public.
No, it was never produced because why would anyone put a 383 crank in a 440? Plenty the other way around though. I might be wrong but aren't the SS Hemi guys using smaller journals in their engines? I heard Honda bearings.
