[C10 - C90 Bill]

In the meantime, I checked on the Casting Numbers from the Blocks.

The 3921968 is from 1964-1976, which covers the '69 Date on the Block.

The 366855 is from 1966-1984. If all the parts on the newer engine are original, I would say that the engine is closer to 1984. I can see some kind of Date Code behind the dipstick on the newer engine, but it is not real clear to me. I see what could be an 8 or 9 (possibly '78 or '79).

Bill