Your 2 Barrel maybe a 550 CFM Carb.
Aftermarket Holley carbs flow more than the stock Motorcraft on there, and they are rated at 350cfm and 500cfm... But, that's not all. 2bbl carbs aren't rated at the same vacuum as a 4bbl, so they actually flow LESS than their ratings when compared to a 4bbl.
I don't know what a stock Motorcraft flows, but it's nowhere near 550cfm.
As to the original question....
Is this car driven much? On a totally stock, smogger engine, the 800 Double Pumper is way more than the engine needs. You 'might' get it to work, but the fuel mileage will be HORRIBLE, and any increase in performance will be minimal. That big carb is calibrated for larger engines/higher compression ratios/headers, etc. The calibration will be WAY off. You'll be very lucky to get it to carburate and transition smoothly between circuits, let alone provide decent drivability and air/fuel ratios under different loads.
If all you are worried about is wide open throttle at higher rpm, you can probably tune for that, but the engine will probably run terribly everywhere else, and give HORRIBLE fuel mileage.
Of course, if you are going to install the intake, it can't hurt to try it out. I'd just wager that you'll eventually either use an adapter to switch back to the 2bbl until you can build the engine the rest of the way, or buy a different carb.