Sure propelled that heavy truck well. Better than I imagined. I really don't want headers. I have 340 exhaust manifolds and can run the modded magnum on the passenger side. Cleaned up 1.88 J heads I have and the right cam with that dual plane manifold you gave me and a compression boost would be an easy 300 ponies and good torque with some fuel mileage to boot. Run that while I fund a good 340. I like the idea of the 360 stroke on a big bore 340.