Today, dollar for dollar, is the 318 faster than the 340 ???

Nice and I bet it has a trunk load of street manners. While you are out cruising and having fun, the guy with the 600 horse small block is back at his garage cleaning the tires. His car isn't a lot of fun to drive any more. Every time he blips the throttle the tires go up in smoke and it heads for the rhubarb like a Mustang at a car show!

People forget about the traction side, if it's not a dual purpose or a car you want to be able to melt the tires at any speed you don't need all that much power to have fun and 273/318 are a lot easier to hook in the streets.