Forget the restoration business, the money is in the custom street rod business. There were a bunch of street rods selling for $100-500K. Resto-mods/pro-touring type cars are becoming the rage with a stock looking body but modern drivetrain and bigger/wider wheels. I sold my 68 Camaro 4 months too soon. I could probably get $20K for that car now that the smoke has cleared from the auction.
