Just switched to carb and have no knowledge of how they work. I bought a holley 650 double pumper. How do I adjust the air/fuel ratio. What else do I need to adjust for the Carb. It wont run good unless the choke is all the way open--is this ok?? It's a manual choke. Also I have a MSD probillet distributor no vauum secondary. What is a good degrees to time the engine and how about the fuel pressure it's at about 6.5 lbs now. Anything will help, thanx