[dscott]

This is how I do it. I set the body on the frame and check to make sure it's resting flush on the front fender liners, the out rigger, and across the frame member under the package tray. If it doesn't sit flush you need to check and see what's hanging it up. Sometimes the bolts that go through the hood latch box interfere with the lip on the defroster plenum. Also check that the body is down tight on the cowl bar. If it all looks good I center the front clip and attach the mounting bolts in the location in the manual. It is a good idea to tap the holes for 1/4 threads and use a larger fender washer to disburse the load. I then proceed to attach the body along the door sill floor and package tray. Finally at the rear I raise the body about a 1/2 " so it isn't resting on the tank or the bumper attaching points and use the brackets to secure it.

I have never seen that raising or lowering the rear clip makes any difference with the door gap. It usually sets the rear of the body at a different height so you have to fill the front to match.

To attach the doors I remove the mounting plate from the cowl bar. A sawsall will work. I then loosely attach the plate to the door hinge which you should have already mounted to the door. I set the door in the opening, set the gap so it is equal (or as close as you can get it), I use shims and duct tape to hold it in place, swing the latch plate back in position (make sure you tighten all the bolts once the plate is in position). Then have it welded in place. Once you remove the tape and shims the door should be almost perfect.
Don