my vote is for the 6V-53......you can fit those in pickup trucks even with twin turbo setup on them. Aluminum would be desireable, but the truck should handle the cast iron version as well.
N/A 6V-53, 216 hp @ 2800 rpm.......1485 lbs. Those are the specs i got
and lets be honest, you can't beat that sound either
2011 VW Jetta TDI, pretty well loaded without leather.
2006 GMC Sierra D-max, 4x4, 4 door, bumper, winch, Espar heater, and the HID lights are a nice touch too.....
1986 GMC 3500, 454 on propane, 4 speed, 4x4, crew cab dually......the welding truck
1984 Toyota 4x4 pickup, 4.3 V6, 700R4, Toyota t-case.......transforming into 4x4 cage buggy