Thanks to everyone. All good information.
I realize it takes a lot of experience to get good at tuning carbs for street / strip performance.
I would like to get mine dialed in close enough so I can get it to a performance shop that has the know how and a possibly a dyno. Right now the plugs are sooty. I have it close on idle around 12.5 AFR or so but just off idle (around 1500 RPM) it goes fat. About 10.8 to 11.2 on my AF gauge. The carb is out of the box 950 street HP without any tweeks. I haven't checked manifold vacuum yet so could part of the problem be the power valve?
Everything is fresh. I might have 25-50 miles on it. (505 "B" block, trick flow heads, Comp Cams XE282S-10 cam)
I like to do a lot of my own work so I would like to get a good book so I can read up and at least understand the more complicated areas of tuning. I will get it close then hand it over to the pros.
Thanks again!