340+ for the STREET
The 318 2bbl was rated at 230 gross hp up to 1971. In 1972, they started using Net horsepower and the 318 fell to 150. 318 Magnums were rated at 230 hp Net. Net is all the accessories being run. If you pull a stock 318 magnum from a Dodge Dakota, and put a 4bbl on it, it will have more hp than a stock 318 pulled from a 70 Duster with a 4bbl on it. I'm not debating, but the 318 magnum has from the factory:
- better flowing heads w/bigger valves
- better compression
- lighter rotating assembly
- there are some more details that I won't get into....
