Which is the correct screw to adjust idle?

[92470]

I should know this, but which is the correct screw to adjust your idle? I have a 71' Cheyenne with a stock 4bbl Quadrajet and the stock SB350. Right now, my idle is about 600 rpm parked and drops too much when A/C is turned on or put into gear. I would like to adjust the idle up to around 750, but can't remember which screw to turn. I hate to ask this, but a picture would be great as a reference for me. Thanks in advance!

P.S. does anone know what the factory spec. idle rpm is parked and in gear? Everything is stock, and I would like to have adjusted to what the factory specified, but can't find that. Thanks again.