Originally Posted by pmckechnie

This may sound far out but If memory serves me, all cars sold in the US in 1974 had to have a system to keep the car from starting if the seat belts were not connected. Maybe somehow your car never had this system disabled and it is causing some kind of problem. All I remember is that there were sensor switches in the seats and in the seat belt buckles. It was only used in 1974.
Just a thought.

Paul