realistic goal? 359 HP?

[JDMills]

I Have been thinking about my long term goals for the D350. Not having experience with a bombed engine, I am left to daydream..

If my goal was one Hp per cubic inch, would I be wise to :

go for a 35 or 50 psi boost gage?

Stock or Ported/modified turbo housing?

Run the original head, or plan on swapping it for the later ones with better injector options? (any opinions on how much the original injectors are able to support )

get another head as It will be helpful, and port it before installation?
(do I remember Joe D. saying that the late '93s had a '94 head on them? and that they flow better # then the first generation heads?)
Is a reground camshaft going to be required?

Should I quit while I am ahead and try to be more realistic? Or does drive-ability continue to improve up through the mid 300 hp range?
Last question: Is there any simple correlation between Hp/Tq? In that My truck is a 160/400 so it produces about 2.5 ft.lb per Hp. Is that the general rule? does it stay constant as Hp is increased? If It was a general rule of thumb, then would I be hitting around 900ft.lb of Torque if I ever get to my goal?
Jason