Frame problems For 86 Mazda

I just got a 1986 Mazda B2000 It is fully bagged, with a three inch body drop, I got the truck for Five hundred bucks, The guy :loser: who had it thought the motor was gonna blow cause it was knocking real bad, turns out he spun a rod bearing, paid fifty buck for new bearing and its been runnign strong since, my problem is where the cab of the truck and the bed meet. The body lines are not lining up and it looks like they're at an angle, it looks really bad and i cant figure out what it is :screwy: I have tried everything, so any help or comments would be helpful
Thanks

Look at the frame where the front of the leaf springs meat the frame. They had a problem with rusting out there. If it's rusted out, it's time for a new truck.

by the sounds of the body lines not lining up, I would think that the body mounts are worn/rusted out. check those first