That vid shows too different block. Both look like the decks were cut .250 or better and both show a bit different lifter valley. Id swear 12-15 years ago these blocks were listed on ebay but I could be wrong but I do follow these old ones close as they were semi cheap to buy.

First pic is one of mine and then screen shots from the vid.

Almost looks from the lifter valley on the one by some of the casting marks a different core box was used.