Buying first truck

[Octopi73]

Hi I'm new to the website and seeking advise. I found a 1969 c20 for sale and the guy is asking $1500.
Link--> https://duluth.craigslist.org/cto/5676994183.html
I went to see it today and take it for a drive. The guy said something about the hose on the engine being from something else on the right front. The rocker panels are pretty rusted and you can see through the corner of the floor on both sides. He also said sometimes in the heat acts flooded and you have to just hold the gas pedal down and crank until it starts. So I took it for a drive and it was a blast. Pulled over and was checking things out on it and it ends up dying. Before I left he messed with the screws on the carb so I thought that it might just be not enough gas being let through. So I started it back up and proceeded to drive it back to his house when it starts dying when I slow down to a stop. Finally got it back and he took a look at it and said the thermostat blew. It was pretty hot out and there was fluid then leaking from the, I believe, master cylinder. He said he would fix it as he is a mechanic. It has a 350 which I've heard is good, but I'm worried as to how often this would occur, along with the rusted floor and rockers. My mom is also worried about if I drive this 2 hours to college how reliable it will be. Just asking for opinions and thoughts. Thanks!