The busch series is more of a feeder series. Generally a driver will come up through the Busch and/or Craftsman Truck series before they go into Winston Cup.
As far as the car goes and I know, they are exactly the same except for the engines. Cup cars will get around a 100 more HP than the Busch cars. A few years ago they changed the compression ratio on the Busch cars and now it's closer to the cup cars...but I'm not sure of the exact numbers? Thinking cup is 14:1 and busch is 12:1 from 10.5:1? The busch cars used to be 6-cylinder too, not sure how far back that goes...think they have been 8-cyl since I've been following Nascar.
Are far as the racing goes...I've found the Truck series to more competive and a funner race to watch the past few years than the busch. Should try to convince the TV network by you to show a couple of those too.
