NASCAR Racing: cup car vs busch car, busch cars, busch car

Question
i would like to know what are all the differances between a cup car and a busch car?  

Answer
Sorry, but I don't keep up with the Busch cars. I can tell you there are several little things, but the one difference that counts is the carburetor in a Busch Series car is smaller. Everything else about the engines in the two series are the same. NASCAR wants technicians in Busch Series to be familiar with those engines before they move up to Winston Cup.