Worn door pins are a common problem with trucks made before 1998. VERY COMMON. You can buy hinges from ford for about 100 dollars a pop... You'll need two per door.
I know places like NAPA sell door pin kits, where you replace the pins in the hinges, but I have never used them, I have replaced two sets of door hinges though. Bymyself too lol
But, open your door, and grab the bottom corner of the door, and place your other hand above the handle, near the bottom of the window on the EDGE of the door, and lift with your hand on the bottom. If the door moves ANY, you need new pins/bushings. My 82 is starting to go. The way you described it, your pins are worn.
As for the seal, get yourself some, I think its 3/8" tubing. Flexible tubing, for like water or heater hose the water may not be flexible enough, and shove into your door seal with ALOT of lube, or soapy water. The door seals become compressed over time, and dont seal as well as they used to. I know in the mornings, when its cool, I can see daylight out of my drivers door between the cab, and door near the back. I have been wanting to put the tubing in my door seals for some time, but never got around to it. I saw it posted somewhere that someone did it to their truck and it worked for the air coming in. I hate the noise that goes with it too.