Heads, intake manifold, block and water pump as well as the distributor all have date codes cast into them for quality control at the foundry. The VIN wasn't stamped into the block back in 1961 (I think GM didn’t unvoluntarily help the government fight auto theft chop shops with VIN stamps until around 1964 or‘65) so I would be surprised to see one. The date will be stamped month and year. The engine castings usually were assembled and dropped into the car about a week to ten days after being cast and should all be within a week of each other or so as that was the usual lead time (6 days). It will have the interior color and material (vinyl or cloth, bench or bucket) and the color of the paint( top and bottom if a two tone or convertible). The Convertible part is identified in the model number (telling you if you have a two door or a four door, a sedan, hard top, sport coupe, or a convertible). It will also list the major RPO options installed (tinted windows, console, twin antennas and other things hard to remove).