Back when my 1970 318 Dart was on the road,I swapped a mild elgin cam in and later I bolted down a 360 4bbl intake and carter afb with an adaptor plate.The car had a stock single exhaust and otherwise stock driverain. I took it for a spin and the power compared to the 5.0 mustang 5 speed i had previously owned blew me away. That thing would have eaten my Mustang..
I never could get that AFB to idle right ( even with a rebuild)and ended up going back to the stock 2bbl which was all I could afford at the time.