The most cost effective way to get a 2.9 running with a 'modern car' level of power density (just under 200hp/L) is with boost. I've had mine on 15psi for about 6 months now, and apart from the initial teething problems and my own personal goals with the truck (complete rewire, Coil pack conversion, etc) it hasn't affected reliability at all. I've towed cars, pulled people out of ditches, taken it to a track once or twice, and it hasn't missed a beat. Completely unopened engine, too. Still has junkyard warranty stamps on the freeze plugs from when it was last replaced by the previous owner. I could 100% see a single turbo 2.9 on, say, 8-10Psi Running as long as an N/A, stock truck. Mine is currently pushing 320hp at the crank, and with my turbo selection (t3/t4), butt dyno says 350ft/lb of torque, right at where the engine makes peak torque, 2600. There's power hiding in an N/A, truck 2.9, too, but parts are hard to come by, or come with an overseas price tag. Pacesetter headers are getting hard to find, Scorpio intakes are getting even harder to find, not attached to a scorpio, cams are pretty much morana or burton power, or a custom regrind, and everything else internally is pretty much strictly morana at this point.