Safest way to sell car

Whats the safest way to sell a clasic car? Some much fraud out there. Called the bank and said even casher check may take two weeks to clear.:wack: Called my insurance company and they say if I sign title and realese the car they will not pay if check is fake. :violent1::violent1: So what to do? I ask because my wife has decided to sell her 1966 mustang GT because she doesn't drive it. Looking for a little advice. Help :prayer: