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[MiracleMax]

Yeah if you go buy the info in the auto math handbook, using a conservative 3500 fpm (feet per minute) plug it in like this;

RPM = (3500 x 6) / Stroke in Inches

7000 = (3500 x 6) / 3.00 (302 stroke)

but thats just saying how safely it can rev to.

As for easy reving the engine with the lightest recipocating mass and valve train will rev the easiest, because there is less to accelerate.

Each of the aformentioned engines has its tradeoffs, However if one was chosen as a purpose built engine I think the 302 would be the best bet. in stock hydraulic roller form the engine is limited to probably about 6000 rpm (probably even less if its tired), but give it a solid roller valvetrain with light weight components and it would probably clean house on the rest. Then again shorten the 4.6's stroke and give it a bigger bore and it would take the lead. Just depends on what your trying to do?