Gee, somebody seems to have forgotten the Continental built (I think, but it may have been IHC) RD602 602ci inline 6. We had them in our M54 trucks (Truck, Cargo, 5Ton, 6X6 was the official nomenclature) They had a Holley 885JJSG 2 barrel that gave us roughly 3 mpg. The wrecker was a Holmes 850 twin boom on an M40 chassis (same chassis, but no bed or box, just the cab) It got 2 mpg empty and 1 mpg towing. I seem to recall the redline was 3500 rpm, but there was a warning label not to exceed 3200 or the clutch could explode. I don't have the HP/Torque ratings handy, but it was a stump puller from what I remember.
Bill Vose (Old School Hot Rodder)
1986 F350 crew cab DRW 460ci EEC-V MAF/SEFI, E4OD, PMGR starter, 160 amp 3G alternator, 12X3 1/2 rear brakes, Traction lock 3.55
1995 Lincoln Continental (project car), 1994 Taurus LX (daily driver)
"growing old is inevitable, growing up is optional"