Build me a truck engine..........

I like whats been said i would find a 5.9 magnum and over drive transmission. I used to have a 93 Dodge 1/2 two wheel drive truck. It woukd pull my open car trailer and race car just fine. Unloaded and running 65 to 70 on the highway I could get 20/21 mpg. Or you could build a 408 stroker magnum and run the fuel injection on it