I can give you the part numbers out of the Buick parts book, which are different.
1950 thru '53 series 40 =1341508
1946 thru '50 large series (320 engine) 1346870
I have never tried this swap, but I feel sure it will not work. The 1941-1950 series 40 (248 engine), pump is the same as the 320 engine, but the 263 is different.
If I am wrong, someone please let me know.
Gary
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