Originally Posted by BroncoHauler
Ford did just come out with a 7.3-liter gasoline engine for their Super Duty's. 430 horsepower at 5,500 rpm and 475 ft.-lb. at 4,000 rpm.
Good point that is true! Probably for the economy although the 460 was pretty good and at today's diesel prices you are almost better off with gas.
As far as the blocks, probably time period correct. Most lifted trucks/vans rear lift were blocks, add a leaf, re-arched leafs, and shackles. Jeep lift kits may have included front and back springs but just too costly on pickups/vans. As I mentioned they got the cheap route. Vans had not really ventured into the back road exploration like today. They were mainly weekend getaways to the mountains and the beach. Most folks could not afford a 4x4 van, so they played it safe.
Lastly, It does not look like a rear Dana 60 to me but a gauge them by the gear cover.