Edelbrock Carb Flooding, HELP?

[429mustang]

So I'm running an edelbrock 600 carb (manual choke), it's retarded. I can't get it to stay running good and I don't know what could be messed up. It will run real rich for a while, it's studders and floods out about 3/4 of the time and almost stalls when I give it more than 1/4 throttle. WHen I start it, sometimes i'll have nice circles on the ground from my turndowns spitting out carbon. So far I've taken the airhorn assembly off twice to reset the floats, it ran fine for about 3 days after the first time. Last weekend I set the floats slightly lower, removed the choke and grinded/polished any casting marks and defects and contoured any sharp edged hoping to get air in slightly better. It felt the fastest that it's been so far after I put it back together, but that only lasted 2 days. Now it's back to flooding, sometimes it'll almost stall when I brake hard. The only thing I can think of is maybe dirt isgetting past my filter and getting stuck in the needle/seat or one of the floats has a real small hole and is taking in gas after a while, but it always runs good after I take it apart. Any ideas? I want to get a Speed Demon, but I'm moving out saturday and won't have money for a few weeks.