340x vs. Edelbrock aluminum heads.

With aluminum heads you actually have to run a point higher of compression just to equal the power of a set of iron heads,they are less efficient due to shedding heat quicker.Its also very hard to beat the price and power output of a good set of stock heads,when bowl ported and with quality work they come in cheaper than a set of aluminums.In my opinion unless you have a big budget or want to go faster than twelves in a street car x heads would be a great way to go.