after new carb, cannot get idle down without stalling

[colbyclay]

Hello everyone,
I am working on rebuilding a 1971 C-10 with my dad. We recently put on a new Quadrajet Carb and replaced the points, condenser, coil, and distributor. (here is a link to my post on that):
http://67-72chevytrucks.com/vboard/s....php?p=4123824

Now, the truck turns over beautifully, but we had to set the idle to around 6000rpm! We set the points with a dwell meter, but when I try to back off the idle, it stalls out. I tried adjusting the idle mixture with the screws in the front of the carb, but that didn't have any appreciable change. Any ideas on what we could do to get it down to a normal idle?

Thanks