edelbrock 1406, running way rich, how do i tune them?

You got some good info from some of the guys. Larger cams can greatly affect idle vacuum. If vacuum is too low, the metering rod pistons will not come into play to restrict the jet orifice by the metering rod and so it runs rich. The hesitation you feel is when the throttle is hit, it gets an instant vacuum "shock" and it goes lean for that split instant but then goes back to rich. It appears you need lighter springs or fatter metering rods. Check float level by holding the removed carb top upside down. If the floats are parallel to the gasket you should be good to go. NEVER run more than 5 lbs of fuel pressure with these carbs. Even 5.5 will allow GRADUAL flooding! I've been doing carbs for over 50-years and I don't think one problem ever possible didn't happen to me! LOL! I'm not putting down the Eddy carbs but this is why I always recommend a Holley for applications with vacuum reducing cams. Nobody seems to respect the lowly vacuum gage these days! The power valve in a Holley carb does what the metering rods and springs do in Eddy/Carter-type carbs. The advantage is that the Holley power valves are numbered to relate to you engine's actual vacuum reading. Let's say you got a Holley List 4777 650 cfm double pumper. It will come out of the box with a power valve marked 6.5. This means that it will remain closed and restrict fuel to the power circuit until vacuum drops to 6.5 hg. Therefore, a lower number power valve is leaner. A 10.5 will be much richer. If your engine with custom cam has 17 hg of vacuum at idle, or higher, a 65 power valve will be beneficial. Watch that vacuum gage drop when you gas it! It is so much easier to tune a Holley to vacuum than a Carter/Edelbrock. The lowly vacuum gage will also tell you if the carb is sized right for your engine. If the gage reads zero or very near it at WFO, the carb is at max volumetric efficiency. Hope I helped and didn't confuse.
Pat