1971WARBIRD, Put the 403 in. Want be #s matching but would be correct. Correct engine doesn't hurt car value like wrong engine.
Changing to 4 speed nothing would be right, starting with vin. To do the 4 speed conversion right would take another car for parts, pedals, steering column, trans tunnel, wiring harness, console, reverse linkage to column, clutch linkage, etc. etc. etc..
The Olds automatic cars are not as collectible as the 4 speeds but they sure are popular and wanted for drivers. In my area selling a Pontiac motor is not a problem, finding a 400 or 455 to buy, just don't happen.
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