Choke Problems - Won't Open

[WarpathEngineering]

Can anyone explain to me in simple terms how to adjust the hot air choke on my quadrajet? For whatever reason it's not opening up and causing the truck to flood out. It's a rebuild from Guaranteed Carb and only has about an hour of run time on it so everything is correct, free and should work. The choke cover is blank and doesn't have the standard markings. I attempted adjust it cold to stay open about an 1/8" in but if I get that far the butterfly just flies open. Do I hold the choke closed and adjust lean until the linkage starts forcing the butterfly open or do I adjust from the lean sided and richen until the doors close to 1/8"? Totally F++kin' confused!

Before anyone asks has new: Plugs, wires, cap, rotor, coil, vacuum hoses, unused carb ports have new caps, open headers, fuel pump & hoses from steel line to engine. Engine was running albeit rich and somewhat rough before any modifications were made. Timing was not changed and hasn't been checked yet. Carb has not been adjusted in anyway other than attempting to adjust the choke.