Crank Journal Size: Mopar Versus Chevy

If he's buying a stroker kit with Chevy rods, I would certainly expect the crank journals to be the proper width for the Chevy rods.
Where you run into rod side clearance concerns is putting Chevy rods on cut down Mopar cranks. Aftermarket stroker cranks with Chevy journals are Chevy width.
I still stick with my recommendation for the reasons I gave, above.
Sorry, I'll take strong light internals over needlessly heavy stuff, every time.
(Well, maybe not in a diesel, lol)