I just rebuilt my quadrajet carb for my 327 and put it back on this morning. Had all the adjustments per the rebuild kit (from NAPA), but it wouldn't start. So I messed with a few things but didn't really change anything except the idle screws at the throttle body. I turned them in from where they were. The next time I turned the key the engine fired right away and idled up to like 5000 rpm (really high, I don't have a tach). It wouldn't go down until I shut the engine off, and I tried everything I know to try and influence it, but the only thing that would change anything was to screw those idle screws out, but then it wouldn't start again.

So what's the deal? I even disconnected the throttle linkage and backed out the idle adjustement screw so the throttle blades should've been closed. But it's still running rich (lots of smoke) , and it's acting like it's getting a lot of fuel. Any ideas on where to start? Anything sound funny (like backing out idle screws causes it to not start?)?