What you have is a 1978 Factory Replacement carburetor. It is a Holley 4150 600 CFM that was used by dealerships to replace 4300 Motorcraft carburetors on the 351, 429, and 460 powered NON CALIFORNIA emissions cars.
What makes this hard to find info on is because it is a factory replacement carburetor FORD does not include servicing this carb in its factory manuals, and Holley does not support carbs of this manner either in its numerology. Good news is these are all pretty generic with the more common 4150's.
These carbs are actually pretty common though since MANY dealerships replaced those "wonderful" 4300 carbs rather than work on them and they eagerly replaced them with the old standby 4150.
Bill White
White Automotive
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HAVE A NICE DAY!!!!