how can i get 400hp out of a 318?

Here's a few links. Is it really true? I don't know. Good info though.
http://www.popularhotrodding.com/enginemasters/articles/mopar/0667em_mopar_318_engine/index.html

http://www.moparmusclemagazine.com/techarticles/mopp_0409_318_engine_build/index.html

http://www.hotrod.com/howto/113_0304_318_small_block_build/