340 or 408?

if just those two choices i think i'd go with a 408. seems guys make 500HP by accident with them. i think it would be less high strung then the 340 at those hp levels too..

what about a 416 from a stroked 340? that should be easy to get 500 hp from too.. :)
I'd like to get Edelbrock aluminum heads for my 340, and they're not that expensive, about the price of my Holley Sniper setup.

That said, I have plenty of other things to spend that money on right now. I want Moon valve covers but will stick with my stamped steel cheap chrome valve covers for the moment.