who really knows 3g's?

I want to know if the rumor I here is true about swapping the head out of the evo into the 4g64 3g. I don't think it is but I keep reading and hearing it is and I need to know if it really is true. Someone who is the expert please answer.

It is true. But it is an expensive project. Hp to dollar ratio is very poor as well.

What is the ratio and how expensive can it be?

Also, where can I get this head and how will an already port and polish affect it, or will it. And does this head kill the bottom end or is it the same? I have a ton of questions but I will ask them slowly.
thanks