OK, so I purchased this 1955 Chevy pickup with a 1974(?) 350 engine (Engine Casting #3970010) and the 4-barrel carburetor shows evidence of leaking. Attempted to find the Model Number, but can only find" "Carter Carburetor manufactured for GMC" embossed on the body of the carb. No tags, no stamps on the base of the carb that I can see. Want to purchase an overhaul kit, but?!?