I have a edelbrock 600cfm carb that I bought on ebay. The previous owner said that it only had about 100 hrs on it. It looks new but runs overly rich and poorly on my 283. I tried it on another engine and it also ran poorly on it. I was told that the edel 600 carbs have larger jets than it should from the factory. I have a 283 freshly rebuilt with new pistons, 9 to 1, .60 over, crane 266 cam-210/210/440/440, stealth dual plane. Someone told me to forget the rebuild of edelbrock carb and get a holley avenger 570 cfm. What do you all think? thanks for the help.