Hello MAXVELO,
You've asked for what might be termed a "six beer" answer to your questions.
I'd suggest you log in here:
385 forum
and spend a few minutes looking at the head info - and maybe a few more minutes doing some searches.
The short answer is "it depends" - on the rest of your build, and its intended use.
Not ducking the question - just too many unknowns. See if that site can help you focus!
Tom