Super Six Idle Issues... Bit 'O' Help Please!

First, RRR, what were you doing awake and on FABO at 4am???

Second, DUH!!! Of course its lean... You ever get so fixated on something you ignore the obvious? I was so hung up on the fact that I backed the idle screw all the way off, that I didn't pay attention to the clues the car was giving me...

1) Its getting hot (lean condition)

2) Part-throttle cruise surge (lean condition)

3) Diesels occasionally (lean or timing)

4) The carb is making that "lean whistle"

Thanks all for setting me straight! It better not be a bad manifold... this one is cast iron, so hopefully I'm good there. I'll let you all know what I find!