Need opinions

Probably 275hp or so stockish, and 325ish with 400 foot lbs at 3,500 RPMs with the right cam.
What you are asking from yours is almost exactly what I wanted out of mine and to keep freeway gears.
RustyRatRod (Rob) helped me when I asked almost that exact question.
I went on Youtube and looked up videos with different cams and found one I liked the sound of.
Then I looked at the duration and lobe separation for torque and sound, and considered my available lift limitations.
Got a custom grind from Oregon Cam Grinders for right at 150 shipped and mine is a Magnum cam (usually hundreds more) as I see Mag cams for 325-350 normally.
With a stock bottom 5.9 (360) with 9:1 compression, and Edelbrock 600, Edelbrock dual plane intake and 1 5/8 tube headers I got right about 350+hp and a little over 400 lbs of torque at 3,500 RPM's

I cheated and went a bit farther with it and added a 5 speed automatic out of a 1995 Dodge Dakota, so it not only gave me the lower first gear but 5 speeds total.
It now does 1,800 RPM's at 80mph on the freeway. (our speed limit is 75 on the freeways) but everyone does 85-90 on average.
Have I got a surprise for them. :D