Yes, I went with an unported Gen III intake (having tried my own ported one); as I wanted more torque, not more peak horsepower at our elevation;
Unported Street Striker heads,
My own cam grind 234/236 (not very aggressive), Gen IV oiling system, Billet main caps, treated crank, good rods and 11:1 for pump gas. So, the short block is overbuilt. I'm still at 505 cubic inches.
Lots of tweaking but the combo yielded very good results: relatively quiet, no smell and 18 imperial miles per gallon on the highway.
Not a race truck (still with 4 cats, etc.) and other than removing the spare, still quite heavy (5585 pounds) with driver.
Stock suspension with M&H drag radials.
According to dyno pulls through the automatic trans and power required to run 115 miles per hour at nearly 5600 pounds, the flywheel power is sitting right at 800.
So it worked out just fine.
I like NA as it's a challenge to get the balance right where you want it.
And yes the Gen IV heads are great performers, out-flowing the Strikers in the all important mid-lift area. Not that more flow is always the measure for more power, but in this case the out of the box Gen IVs work very well.