Here's a pic of my ProSystems 950HP 4150 build sheet.
Idles mixture screws are 1 1/4 turns out, power valve in the front only. I have 2 light weight springs in my distributor, I even stretched them a little so my timing is pretty much locked out, idles around 30 degrees and goes to 34 total when I rev it.
Runs great on the street and idles nice in gear.