I tried to tun a 650 Eldebrock on my 78 camaro with a 350 in it. I had nothing but problems with the acc. pump and needle seats. I was having the same problmes you're having. I bought the carb new and it did fine for about 6 months. I switched to a 650 holley and never had any trouble again. I may have gotten a bad one but the fuel pressure may have been the problem all along like Dave said. I never thought of that.
Last edited by jmt277; 12/01/11.
