Just left the machine shop and they have finally started my engine. He told me that I need to take the eldelbrock 600 off and put a quick fuel 680 on it. What is the best carburetor to put on my engine? 305 bored 30 over, eldelbrock intake without EGR, and 268 comp cam. The engine would stall out once you release the gas. Do you think I should buy one of rebuild the one I got?