C'pete, great find. good starting bid price.
If it's correct to the specs then it is a real goody. Pg171 A/C Manual.
Added expense is getting the ruddershaft hole (3/4"X3/4"D) milled.
Has to be accurate.
Side pins can conceivably be drilled while mounted to the boat, but really easier and more accurate to do on the drill press with holding jig. And a breeze to add the chamfers for peening into.
How do we tell one bronze from another?
Is there some provenance with this casting?
Finishing the bronze is more a matter of fit than removing the casting marks.
Sandcast surface is not rough and makes a good surface for paint. Not that S.B. needs paint.