MP Stage V heads

Hey everyone i am looking into buying a set of heads for my drag car which is stock stroke 383 and was debating between the 440source heads and the edelbrocks and then i saw the MP Stage V heads for $650. Yes they are bare and i will need valves,springs,locks,retainers etc. but is there anything i should know about these heads before i purchase them? as in do i have to do anything "extra" to make them fit on my 383? what combustion chamber are these? Would it be worth buying these over the other choices that supposedly run out of the box? What do these heads flow out the box? This is going to be a race car built on a budget and my budget actually seems to like these heads even though they are bare.