Here are some vendors you might try:
Antique Auto Parts Cellar, 781-335-1579
NB Pease & Co, 413-283-7620
Terrill Machine Inc, 254-893-2610
Good luck. main bearings can be hard to find, but can be relined.
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Bob Shafto
1936 Pontiac Master Business Coupe 26-2607A
1936 Pontiac Cabriolet 26-2667A
1966 Ford Galaxie 500 Convertible