Not Ranked
I assumed the 28oz and 50oz cranks had about the same weight, and the heavier counterweights on damper and flywheel are necessary due to the use of heavier pistons and rods in the late model engines (i.e. 5.0 HO with forged pistons).
If the weight of the flywheel and damper only was increased to use a lighter crank (for whatever reason) then you are right of course, the total mass will be the same and there's no difference in revving up.
As far as my initial question is concerned, the 50oz crankshaft seems less acceptable in this case. If it is lighter than the 28oz this means more material in form of heavy metal would have to be added to balance the heavier forged pistons and aftermarket rods.
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