Aluminum 4-bbl dual plane intake

So what are you using the truck for? If it's hauling stuff and you are really looking for bottom end torque, I would suggest you look for an Edelbrock SP2P. It is a narrow runner four barrel manifold that was designed for trucks, vans, motor homes. I had one on my 73 D150 (god rest her soul) and could pull stumps and steep grades, especially off road. They are cheap as hell because you wouldn't put one on your small block street machine.