Edelbrock 1406?

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Hello again. I have a 1406 Edelbrock carb on my 72 Blazer with a 350. I just put HEI on it, and it was running good, however, now, it's starting to hesitate, and flatten out in a certain rpm range...i.e., running very rich. I checked all vacuum hoses, choke, and ignition...everything looks good. Here's what I did find.
When I took the air cleaner off and looked into the carburator, I see fuel puddled around the counter weights?? above and behind the secondary plates. Actually, it's at that level all the way around the inside of the carb....is my float sticking? It has always run rich, and this carb was on the blazer when I bought it. It's a 350, and the carb is a 625 cfm....My idle circuit is exactly at 2 1/2 turns...and that seems to be right...I can run them all the way in by hand, and nothing changes...except the engine almost dies.
How do you change a float level in one of these?
Any ideas would be great guys/gals...thanks....