shot peening a distributor gear for a roller camshaft

Could a stock magnum distributor shaft and gear be used since the magnums are roller? I've heard both ways and am having a hard time finding the melonized one on a shaft also. Already have a magnum shaft sitting here.
Apparently Chrysler didn't use billet camshafts for their roller blocks.
If it's a billet cam then we need to use a melonized gear