My father bought a 79 Chevy truck (I don't remember the model anymore, I get them all confused) used in the early 80s that was a converted diesel. He had it six months before it broke the crank. I remember the glow plug lights in the dash and the dual gas tanks. He replaced the motor with an Olds (289 or something) and drove it for another 14 years. At that point, the shops wouldn't inspect it because it was still registered as a diesel and he didn't want to pay whatever the fee was to get it reregistered.