Interesting video, but not enough information. There is a machined pad right behind the distributor, with a stamped, not cast number. The first few digits of that number indicate engine size, 228, 248, 270, 302, etc. Somebody might be able to cross-reference the casting number, but the stamped number will identify the engine size for sure.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!