any dakota guru's? i have some questions

I've never swapped one for the other, but I've owned several 3.9L's over the years.
I've had terrific luck with them. Usually any issues were crank and cam sensors taking a dump. Always replace in pairs. I've found that using aftermarket sensors wouldn't sync and you'll still either have a no start or timing will be way out. What's the current issue now?
not sure yet, my buddy said it was over heating so he limped it home, next time he tried to start it it sounded like something metal broke so he left it alone. the scrapper only offered him 35$ for the truck so he said he would sell it to me for 36$ i have to get it towed to my house so i can dig in and see what is going on. he also said it was smoking real bad, so i'm not sure what to expect. he does not know anything about cars so who knows.