Why are carburetors still used in drag cars and muscle cars as oppose to these cars using an electronic based fuel delivery system?

Why are carburetors still used in drag cars and muscle cars as oppose to these cars using an electronic based fuel delivery system?
You forgot to add: NASCAR race cars also have carbs. Fuel injection systems simply do not have the power or top speed. Most of the "muscle cars" from the 70's (and other cars), all had Carbs back then.