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

So, what I'm seeing is, the 318 guys are drifting over to the 5.2 magnum as the base for their build? I guess that's ok, but its like calling a Ford 5.0 a 302...there are distinct differences and horsepower ratings between, say a 71 maverick with a 302, and an 88 mustang GT with a 5.0 HO engine.