Ditto to what Blazin' said, I will also add: Make sure your hinges have good pins & bushings in them. Take the door strikers out (remove the interior trim to get ahold of the "big nut plate" on the inside, it will fall to the bottom when the striker is removed) Align the doors with approximately 3/16"-1/4" gap to the quarter panels/roof/windshield post & the rockers (if they are good) As was mentioned, these trucks had some questionable quality control on the body fitment even when new compared to what is considered "right" this day & age by most. Factor in prior damage, rust repair & maybe aftermarket parts & things can fall somewhere between fair & downright poor quite often. At the very least quite challenging. Depending on how your doing the project (when your going to paint the parts) Either load the doors or set the bodyline at the quarter panel 1/8" high to account for the weight. Once the doors are fitted, install the striker to hold the door shut. Now move to the fenders, you may need to replace the front cab mount/rad. support bushings or shim under them to get the correct gap between the door & fender. Good Luck, Any other assistance needed, just ask, Lorne