Could be anything if it's a 2.6L, they used that engine in K-Cars, Caravans, Trucks, even Industrial Equipment (Fork Lifts, Generators, etc)
I had a 2.6L in my '84 D50 pickup for many years, the only modifications done were my dad shaved the head (Aftermarket non-jet valve head. 11 to 1 compression), did a Balancing Shaft Elimination, and a Double Roller Timing Chain. That was back when he owned the truck.
I beat the snot out of it every day, and it lived a long hard life until about 270,000 miles when it finally died... Which was surprising that it lived so long, because I would wail on it. Side stepping the clutch, constantly driving around in 4WD (even if the roads were dry)... Damn thing wouldn't get traction in 2WD if its life depended on it :cheers: Plowed snow with it in the winter.
When the 2.6 died, I swapped in a 2.3L Turbo Diesel, and then a 2.5L Intercooled Turbo Diesel, and then another 2.6L (13.5 to 1 Compression, non-jet valve head, header, port & polish, custom cam, balancing shaft elimination, forged crank, forged rods, blah blah blah)
Ran that for about a month, yanked it out and dropped in a Small Block :cheers: :burnout: