I love a Qjet and an HEI dist for a stock car. Axisg made some good points and I agree with a lot of what he says. The farther out the idle mixture screws are the more fuel your are allowing in thus trying to overcome a lean condition. I really do not like an Edelbrock as it is early sixty's technology and we have to remember that fuels today are formulated for fuel injection, so that makes cold and hot soak drivability more of an issue. I used a A/F ratio meter some but mostly used an infrared measuring CO and HC. You should not need RTV on this so make sure it is the right gasket and carb/manifold fit. 10 degrees is a good starting place and close enough to start. Make sure choke is open and lets get it running good hot then we will tackle the cold issues. Stay in touch.