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I'm a little skeptical of these kinds of products myself. They might work or they might not - I'd be concerned that they'll gum up something else (radiator, water pump, small passages) and create more problems down the road even after you've replaced the head gaskets.
If the truck is worth it, the right thing to do is get them replaced. If you're mechanically inclined you could grab a manual and get an idea of what's involved. If you go that route, I'd recommend taking the heads over to a machine shop and have them checked for cracks and make sure they're not warped - they can also check if you need a valve job at the same time. While you're in there you can do the timing belt & water pump at the same time.
Depends if the truck is worth the investment naturally - that's up to you.
Good luck!
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