I think there is a mistake in our 350 block casting numbers. I think your block number should be listed as 72-80. It is listed as 62-80 and we all know the 350 was not made until 68 and all the other casting numbers starting wit 124 started in the early 70s. Other then that, there is a production code visible between the exhaust ports on the top of the block on the right side that will tell us the year and configuration. It may have been removed if the deck was squared during the re-manufacture.