Carburetor Issues, Please Help

67 coronet 500, rough but drivable. Originally a 383 2 barrel, someone dropped in a 73 440 sometime in its life before it came home with me. I performed a tune up, wires, reman distibutor, new edelbrock 750 cfm carb. started her up and ran poorly. Long story short, running extremely rich. I disconnected the pcv valve hose and started running better, figured pcv. new pcv, seemed restricted. I've nearly closed the idle screws to full stop, have disconnected pcv and let vent along with vacuum port for the booster. with those massive vacuum leaks the big block runs like a top and actual turning of the idle screws actually has effect unlike before. WHAT AM I MISSING HERE ?:sad2:

If you've got bad vaccum leaks you are going to want to find and fix those first. It'll be hard to deal with a carb with those leaks going on.

Has it ever run good for you or did you get it like this? While it is running put your hand over the carb like you are trying to stop any air getting sucked into it. If you have a big vacuum leak the engine will continue to run. Take a vacuum reading and see what it is. I was thinking vacuum leak too, especially if it is a known good carb. Make sure all the unused vacuum ports are blocked off too on the carb and manifold and if the dist. has vacuum advance make sure the diaphram in it is good.

If your idle mixture screws are in nearly all the way, they sounds like something else is happening either with your jets or metering rods are not right. How's the float level? Go here for needed tuning info... http://www.edelbrock.com/automotive_new/mc/carbs_acc/pdf/carb_owners_manual.pdf