As Charlie asks, does the engine turn over? If not, then it will need to be torn down to see just what is salvageable or rebuildable. Once you determine this and you do want to put it up for sale, just post it in the classifieds section.
I’ll add that the Thunderbird V8 emblem on the fender is indicative of either a 292 or 312 on those cars while a V8 emblem was indicative of a 272. The big selling point in 1956 and 1957 was the Thunderbird V8 sales pitch for the cars. The 292 and 312's were called Thunderbird V8's when put into the Ford cars. The 272 was the Ford V8. With all that being said, has this particular engine been verified as actually being a 312? The VIN is a good place to start assuming the engine hasn’t been swapped out.