Yeah I can't think of a good reason to use a 4.15 crank with the big Mopar rod journal for a new build. Maybe if a guy already has the parts. But if you're buying new parts I don't see any reason to go with a smaller, heavier and more expensive combination.

There are some nice piston choices now for the 7.10 rod. Mahle has a shelf piston with metric rings, Diamond has a shelf piston and ICON has pistons. I think JE and SRP also have pistons, not sure about Wiseco since I haven't looked at their catalog in a long time.