I am a former mechanic and i hate carbs with a passion, perhaps its because im a young wippersnapper and can't figure out where to hook up the lap top. any way i just bought a 76 28ft mariner with twin pleasurecraft 302 fords and v drives. port engine fires right up and i mean right up. starboard fights you then floods and blows black smoke after a few minutes. so i tried a simple trick and swapped the carbs. starboard now happier than a clam. the previous owner had both carbs rebuilt last year and had continual problems with the starboard engine and had that carb rebuilt 2 more times to no avail. i have recipts for the services. is there somewhere on this toilette like fuel delivery system than can be cracked and causing it to pour fuel into the manifold? or possible something that is easily overlooked when rebuilding a holley 4 barrel? I'd rather not have to buy a new or remaned carb if i can fix it easily.