ID # on straight 8

Hello Buick folks. I have a straight 8 going in a hot rod project. I believe it a 1949 unit but not sure and also want positive ID model # and cubic inches so I order correct parts. Any assistance would be greatly appreciated.

The ID # on block plate (forward of distributer) is 54863965

Thank you!
 
Yes. Super is series 50. Special is series 40. Both had the same engine 1949 and back. Roadmaster is series 70 and had the 320 CI.
 
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