Hi dmc1, and welcome to the Ford Six Forum! Your engines Casting / Design Number basically decodes as being for a 1965 year model, it would take finding the blocks Casting Date Code to determine the exact day that the block was cast. These Design codes really don't have anything to much to do with the type Transmission that was used, as you can use either type of Transmission on any engine as long as you can find and use all the correct parts to assemble your combination. All the Early Ford Small Six Block's from 1960 to 1965 will only have the one small Bell Housing Bolt Pattern. Block's from 1966 to 1981 have two Bolt Patterns, the original first Small Bolt Pattern and the newer Larger Bell Housing Bolt Pattern, all Ford Small Six Ford O Matic's or the C4 Automatic Transmissions can be fitted to any year of 144, 170, or 200 Six except for the very rare Big Bell Housing Block (it has 2/3 of the SBF V8 6 Bolt Bell Housing Pattern and can be converted over to a full 6 Bolt V8 Bell Pattern with very little effort) these 1982 200 Six Big Bell Block's were made for use with the new for 1982 C5 Auto Transmission.
A Quick way to I.D. and tell any 200 Six from the smaller 144, or 170 Six's, is that all 200's will have 5 Freeze Plugs in the side of the Short Block the 144 & 170 Blocks will only have 3 of them.
And one last important thing you must be sure to remove the Pilot Bushing from the center of the Crankshaft, as well as the Clutch, Flywheel, and Manual Transmission Block Spacer Plate if they have not been removed already from any Engine that Originally had a Manual Trans when converting it over to for Auto Transmission use. Then first install the correct Auto Trans Block Spacer Plate from your old Auto Trans engine, as well as the Flex Plate and be sure to use its shorter Flex plate bolts (Add some sealer or Red Lock Tite on them) to bolt it onto the crankshaft. Best of luck