Which Mopar engines breathe well enough to make use of 7000+ RPM?

B blocks have an inherently stronger bottom end than the RB engines. Mains are better supported. A 383 stroke is only 1/16" greater than a 340. Kind of a larger small block.

Modern SS/AH Gen2 Hemis zing to, or just under, 10,000.
But they're tuned and maintained better than a chocolate-covered beer mug.