What size carburetor should I be using LA 360 engine?

What size carburetor should I be using on my LA 360 engine? Right now I have a 670 Holley carburetor. It has a mild cam. The mechanic says the 670 carburetor is too small on my LA 360 engine. And it’s not getting enough gas in the engine. He said I need a 750 carburetor. Right now the car stalls out when I put it in gear.

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What jpar said. First thing I would do is to look for vacuum leaks. Easy and FREE!

Reset all the settings on the carb back to factory, check your plugs AND wires, and, aw hell with it. You have a piece of junk. Ill give you a hundred bucks for the car.