[mattfranklin]

It depends on what is important to your decision.
I think you're probably reaching the point of diminishing returns on airflow capacity.
The motor can't breathe more not matter how big the carb is.
What the bigger carb did do for you was decrease the pressure drop from atmospheric.
If the pressure drop from atmospheric is low, your MAP (or manifold absolute pressure) can't increase.
EngineMasters had a nice episode on carb sizing.
And the Rochester is probably cheap and simple.
There is an elegance and coolness to a clean simple 2bbl.

However, depending on what you like and your budget, Holley is flashier and could have more of a coolness factor. Totally personal taste. There is also more information out there on tuning and tinkering and optimizing Holley carbs. The 390 cfm is probably a good range to be responsive when you accelerate.

Good luck in your decision.