Get some numbers off the block and heads. Because it's blue, it could be a 72 or 3 with low compression, cast crank, small cam, and small valve heads. . Heck, it could be a 318 and without looking close, you wouldn't know. It's a core.
I agree toolman, I think it may be a 318 out of a truck or van, by the shape of the oil pan. I would also assume the heads are from a later SB and not a 340. No X,J,O or U castings on the heads.