You can tear that down and take the pieces to a machine shop to be checked out, or you can, as
@jozsefsz suggested, start hunting for a replacement, or see if you can fix what you have (I'd still recommend a trip to the machine shop with the crank, block, rods, and pistons).
The 2.8 was very common at one time. The mentioned Rangers and Bronco IIs are your most common boneyard sources, but there is also the II, Capri and Capri II, Pinto, Bobcat, Courier, Aerostar, and '79-80 fox Mustangs and Capris.
If you need a whole engine, my dad has a 2.8 from his '76 Capri II in his shed. It ran when pulled, but the water outlet had rotted off of it, and the pressure plate on it was getting weak, and those two items were (at the time) hard to find, so we swapped it for a 302.
I have no idea what he'd want for it.