3935440....396.......68-69...2 or 4 bolt
The other code is T0509??, The motor is from the Tonawanda motor factory built May 9th. You have to look further for the exact year. There is a block casting date usually on the back ledge passenger side and will look like D 12 9 for April 9, 1969. It will be some date before the build date obviously. The last two could be CE which means it is a Crate Engine or warranty replacement engine.
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