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It is a Generation I small block Chevrolet V8. If you want to know it's displacement - who knows? It could be 265 cubic inches to over 400 cubic inches. It does not look completely original, so it could have lots of changes over what the factory produced. Is English a second language for you? This engine is basically the same as millions produced from 1955 into the 2000's.
Take a flashlight, and stand on the passenger side of the car, towards the front. Lean over the AC compressor, and look down, there should be a small portion of the block that extends out where the cylinder head mates to the engine block, this is where engine information should be stamped into the block. If you can provide thos numbers, someone should be able to tell you what you have, or at least what the engine started out as.