Sorry about your luck...
You have the often hated 301 Pontiac engine there. Keep the carburetor, distributor, front accessories, starter, and valve covers; throw the rest on the scrap heap.
You MAY be able to sell the 4bbl intake manifold, they are not super common. You can probably eBay it and make a 20 bucks or so. The rest of the engine is not worth keeping.
The tell tale signs are the oil filter sticking straight out of the block and the narrow intake manifold as compared to other Pontiac V8 engines. It shares the common geometery with the 265 Pontiac, but that one wasn't available with a 4 bbl carb.
Now you need to find a junkyard Pontiac V8 and re-use your carb, HEI distributor, and accessories. You basically have been blessed with parts.