ANYTTHING SHORT OF A MAX-EFFORT 383 C.I. WOULD NEVER NEED THAT MUCH FUEL, EXAMPLE OF "MAX-EFFORT":::: 18 DEGREE VALVE ANGLE OR LESS INCLUDING SPLAYED VALVE HEADS, HEAD FLOW NEARING OR SURPASSING 350 CFM ON THE INTAKE SIDE, MEGA COMPRESSION, OVER 700 HONEST HP, ANYTHING SHORT OF THAT AND A 850-950 CFM WILL PUT YOUR 383 IN IT,S PEAK JUST BY USING GENERAL CARB TUNING TECHNIQUES, TO BIG A CARB IS A AGO OLD PROBLEM, I,M GUILTY OF IT MYSELF, GOOD LUCK, JUST THOUGHT I WOULD THROW MY OPINION IN THE MIX, BEEN DOING THIS GAME FOR NEARLY 30 YEARS!!