idle issues with new A500 behind a fresh 318

OK so here's the deal - THE PROBLEM IS FIXED!!!!!! After spending a bunch of time looking for vacuum leaks and finding none, I was talking to a knowledgeable friend who said, "Hey don't you have an Edelbrock AFB clone on your 318 Swinger? It works great - put it on the GT and see what happens." I swapped it over, turned the key and it was like a different engine - idled fine at 800 rpm, dropped to 5-600 in gear and didn't run rough or crap out. Since it ran great at WOT with the bad carb, I think that it has a fault that was dumping gas at idle. Now it runs great at WOT and it idles!!!

Now to get Edelbrock to take the AVS2 back and send me a new one...