The EPA forced Pontiac to replace the 1979 400ci V8 for the 1980 Trans Am for better fuel economy and emissions, and to get similar horsepower Pontiac put turbo charger on a 301 small block that drew air through a Rochester 4-barrel carburetor. It was primitive by today's standards, but it's a great example of early GM turbo engineering. The 301 small block was the same one in the Pontiac Grand National.