Just some food for thought, the stock OEM 4300D was rated at 715 CFM. I've owned several 351 4V powered cars all with 750 cfm Holley 4150 style carbs. Some were vacuum secondaries and the deep geared cars with mechanical secondaries. All worked well after being calibrated. The more adjustability a carb has the easier and cheaper it is to get it calibrated. Given the mods you plan I'd look at 750 cfm vacuum secondary street carb from Quick Fuel. If you can't stand the bright finish then look at a Holley. The vacuum secondaries will only open as much as the load and the secondary diaphragm spring allow. The spring is changeable to get the calibration you want join terms of when it starts to open and how long it takes to be fully opened.
The Edelbrock performer is going to flatten out at about 5400 RPM. We tried that intake in the 70s and the car slowed down significantly comparde to the stock 70-71 iron intake (DOAE-L). If you want more RPM than that in the future, consider another intake.
Chuck