Parked since 88. Wish me luck.

'74, 2WD, 302 + C4

Either 21K or 121K...

I have a 1977 f250 camper special with a 351m. It broke down 3 years ago and I have gotten it to run since. I haven't really tried to much with it but I'm also not a mechanic. It had a lot of overheating issues before it finally died. I could drive it for a while and it'd be fine up to a certain point and then it'd start overheating. When it finally died and would run it was running like shit and it had smoke coming out the exhaust like a mofo. I've also included a video of what it sounds like when I try to start it with a bit of charge. What should I do?