Clean them and refill them with oil. If they work properly, you're golden. If not, then rebuild them or send them off. Once they're done, they'll last the rest of your life. They actually do a decent job, too. The Phantom has lever action shocks and it's a smooth riding car.
There are several places that rebuild them.
OEM and custom shock absorbers, USA made coil springs and leaf springs, steering dampers for all makes and models. Rebuild service for original hydraulic and lever action shocks. Rebuild service for steering gears and power steering pumps
A-1 Shock Absorber Company 365 Warren Av. unit #101 and 109 Silverthorne, CO. 80498 800-344-1966 or 970-513-8283 http://www.shocks2springs.com/
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)