One of the important things to remember with the Edelbrock is that you need to be sure to install BOTH check balls, not just the one. If either is missing, it will not run right no matter what you do. One is round, and the other is square ( I think it is there for added weight). It may also be that the carb was run without a fuel filter and some junk got inside it. If so, it would need to be very thoroughly cleaned out. I pulled a carb like that from a Malibu once. It looked like sh*t, and had obviously been run without a air filter. Plus, it had rust in the bowl which tells me the car had a rusty tank and no fuel filter to block the rust. I was never able to get that carb cleaned out properly. I ended up stripping a jet when I tried to pull it, and decided at that point that it was not worth reviving.