It will be close to 315 ci.keep in mind that a 350 is not really 350 but 349.xx or look at this way, for every 030 over in bore = 5 ci.
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The term "bored out" usually means that the cylinder has been bored to a new dimension.
What the house power on a 350 bored 40 over rated at
462
91 over 40 = 91 divided by 40 = 2.275
5 over (8 divided by 40) = 5 over 5 = 1 (5 over 8) divided by 40 = 0.625 divided by 40 = 0.015625