408/360 question

I always thought the 360 would be much cheaper to build but no matter how I add it up they're both about the same. Going the 360 route I can save a few hundred bucks but at that I might as well do the 408! I always kinda wanted to try the 392 out of the 318 since I already have it ready to go but does anyone know the hp difference between the 392 and 408? And would the 392 get more hp than the 360? I know the 392 might have more cubes but the 360 has a bigger bore! Decisions decisions!