You can buy a brand new one on Rock Auto for $100 from Cardone. Includes cap and rotor.

Cardone rebuilt my Galaxie 500 dizzy 15 years or so ago and did a great job.

www.rockauto.com/en/catalog/gmc,1959,truck,4.4l+270cid+l6,1341010,ignition,distributor,7108

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)