Carb was made by Weber, it's a 750 CFM. The 7.4 has the small oval port heads. You need to check the serial number, though. In October '95 Merc changed over to a Gen VI block and the heads changed a bit.
Just FYI, the intake manifold on that engine is a spread bore config for a Quadrajet with a spacer. I had a '95 7.4, replaced the intake with a dual plane Edelbrock and the enjum was much happier.....