it's a little over .020 over bore. Stock is 3.551, .020 would be 3.571. Looks to be about .0035 over spec which isn't really far (would be fine for forged pistons) but I'd go ahead and have it bored the extra .010 for a total of .030 over or 3.581.
Don't trip though, you actually saved yourself some money. Pistons need to be bought before the machining is done so that the cylinders can be bored to have the proper clearances. Even if it's not where you want it, if you haven't bought your pistons yet just buy some .030 over slugs and send the pistons and the block to your machinist and have him torque plate bore and hone it for .030 over.
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