If it was my truck I'd start with two things. I'd flush the cooling system and put a new fuel pump on it.
If you flush the cooling system be sure to remove the block drain and use an old clothes hanger to scrape as much crud as possible out of the block. I would then buy two bottles of cooling system flush and follow the directions (except for the amount of flush) to flush your system. If that doesn't help the overheating we can go to step two. I used two bottles on my '38.
Vapor lock is very often the first sign of a failing fuel pump.
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
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