Basic Magnum question: Safe maximum RPM on stock internals?

AJ/FormS said

If it's lazy everywhere, it's probably rich everywhere, and of course the timing may be way off. A little tuning here and there, should wake her up;baring chassis issues like 2.45 gears and a 1600TC, or an overweight situation.
300hp is plenty to have fun with, when all 300 are ready to play

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I'm thinking that you're right on all counts here...
The car isn't overweight...I mean, it's an Abody! Even a V8 big bumper car came in under 3,200, IIRC...that's probably 1000lbs lighter than a 5.9L Grand Cherokee or 1500lbs lighter than a 5.9L Ram. I do have a higher RPM stall so that's probably not it either but there's no doubt that the 2.73 ratio is a big source of the sluggishness. Still, the motor feels like it just doesn't want to rev. Holding it in lower gears helps some but not enough... So yeah timing and carb tuning are certainly contributing.