I am in the process of tuning my 340 with 750 edelbrock. It will idle at 800 rpm and then the idle gets low, if I rev the throttle it returns for a while then does it again, this is sitting in neutral in the garage. I am suspecting a problem with fuel pressure, however I am wondering if anyone else has had or seen this problem with Eddy carbs. The only vacuum ports I am using are PCV and vacuum advance, car has manual brakes. There isn't any vacuum leaks, car is pulling 16 in hg on a vacuum gauge. I am thinking my next step is check fuel pressure, fuel filter, and then get into fine tuning with jet kit at some point. The exhaust is "smelly" no matter how I set the carb rich or lean.