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No way to tell from that picture, but I like the exhaust manifold! Look under the intake at the lifter valley. All 302's had "302" cast there. Pull the water pump, if there's almost no space between the water inlets and the top of the block deck, it's a 302. If there's (how much guys?) maybe 3/4" to the top of the deck, it's a 351.
But the picture is interesting! That's a C6 it is bolted to, and set up for a 4x4. Also looking at the valve covers. Could this possibly be a big block?
It's either 335 series or 385 series...I'm leaning towards 335 myself. Look at the shape of the valve covers, and the back of the cylinder head you can see clearly in the second pic.