small block differences. someone want to fill me in please?

i love the way my 318 just runs up the rpms. the short stroke lets it rev really fast, and i like that. and the stock cam must have some torque on the low end, because even with the 2.45 gears, it jumps from idle.
i guess thats why the 340 is so popular? revs fast but has a bigger bore for more power?