This site has a data on your WD3S (1946ish) Value depends upon condition and completeness as well as buyer & seller. Market is limited by HIGH shipping cost of outboard motors.
It is unusual to find a postwar outboard that is worn out.
Nobody repairs them, except hobbyists who work on their own.
Sourcing parts is part of the challenge. They all ran once upon a time. Winter up north is outboard project season.