best cylinder head

I shall admit that i have not read the whole thread but considering how it seems to have derailed alitle i will try to get it back on track.

There are three obvious reasons why a big cam 340 falls on its face at high rpm.
Valvesprings.
Headflow.
Not getting full throtle at the carb.

You dont need a real good head to effectivly turn 7000+rpm with that much cam in a 340,I have done it with some touched up J-heads and it didnt even need a big carb,it did it with a basic 650 holley DP in the past and that engine ran awsome and was real fun on the street,but it might not be the most efficient way at making power these days,its easy to get alitle carried away in these times when it has become kind of easy to make good power with a whole lot less cam and rpm by buying the right parts, lets try to get back to the basics and figure out why that engine wont make power instead.