4.0L Ford SOHC is the last engine in the world i would put or want in the Aero.
have to pull engine to remove right head. cam chain for right head is located on rear of engine and does not come off easily.
NOT a Ford better idea, just a cheap quicky fix to get the 4L into later emissions requirements. most of the power gains were above 3k rpm which does not help towing or with heavy loads. only about 20 lbs/ft of extra torque

I'd dump my Dodge/Cummins diesel in a second for a decent priced Mercedes diesel Sprinter but they're $50k with any options and Mercedes doesn't deal on price, full sticker or kissoff.