Cam choice?..

But that is the sweet spot for your Duster.
Your truck will be rapped out at 65 with too small of cam.
I am not suggesting a drag cam ... just one that gives you a usable mid range.
I find with today fast hiway speeds even 3.55s seem too deep without an O.D. I never thought I would find myself saying that .
I drove it to 60 miles home and it did just fine on the freeway like it is. Again the truck will be for sale and I just want to sound and feel good..