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Generally the 511" 4.25" stroke with a 6.535" rod is the best overall combo, it can take the same stocking piston as a 451 that uses a 6.76" rod so long as you use a .990 pin. Also be aware that the CR with a 511 flat top will be proportionally MUCH higher than with a 451. For a street compression 511 you typically need a D dish piston to keep the CR pump gas friendly.

FWIW, I think a 3.90" stroke 470" low deck is every bit the equal of a 4.15" 493" RB, you have fewer cubes but that is offset by the lighter bobweight and higher rev capacity for the same induction/cam and CR. But my overall preference will always be the 505-511 4.25" stroke combo that uses the smaller/lighter 2.200" BBC rod journals, they actually require less bottom end clearance work than the 4.15"/2.375 BBM combos....Not that there's anything wrong with the 493 4.15", I just like the lighter bobweight

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And I think a 750 carbs a bit small myself but that`s just me...............