CFM vs Cubic Inches

Considering a carb upgrade. Current carb is a 4640S (750cfm) rebuilt by Woodruff carb. It runs and performs excellently, but I can't help think that it may be a little small for the cubic inches. I should probably leave well enough alone, but I'd hate to leave 20 or 30 HP on the table with an improperly matched carb. The car is a driver not a race car.

69 Chrysler 300 with a 505ci. (Edelbrock Performer 440 Intake, 906 Heads, 2.14 Intake/ 1.81 Exhaust, Lunati 10230703 Voodoo Duration...

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Author: MJFUR