I have a '68 Cougar with a 302 and a Autolite 2100 2bbl carb. It seems to be running way too rich. It was recently rebuilt. What happens exactly is: It idles rough, but when you normally drive it's fine. When you turn it off and try to start it, the carb floods and you have to hold the gas to the floor and crank it, and it takes it a few seconds to finally fire. Then when you look at the carb after turning it off white smoke comes out which I have been told is unburned gas. Basically I need help finding out how to adjust this so it will just fire right up and run smooth. I already attempted adjusting the screw on the driver's side of the carb (which is the only screw I could see) and it is pretty much unresponsive. Not sure where to turn next. Thanks for taking your time to read this!