[68c10airstream]

Try going into neutral to see if it starts. If it does, worn or neutral safety switch needed, or at least adjusted. Gm hot restart issues stem from the way gm wired the solenoid. As it heats up resistance goes up, meaning less amps draw warm versus cold. The real long term fix it to get a new style nippondenso gear reduction starter made for the 350. It is wired the opposite way, as it heats up resistance lowers. Aftermarket people make an adapter plate to marry the starter to a plate to bolt it to the block. The other plus is you can index you solenoid wherever you want it, upside down, away from headers, etc. The nippondenso starter uses ball bearings to support the armature instead of bushings. Gm used to have a tech bulletin if the solenoid wouldn't pull in to use a weaker spring. I'm just trying to help, i hope i don't get comments on foreign/american issues. I just want something to work. By the way i was a dealer mechanic for 35 years, 2 years of auto schooling in late 70's, and specialized in electrical/drivability solving. Good luck