door hinge shim

Do you have the fenders on? Shimming that door back could make your 1/4 to door gap acceptable to you, but open a big gap between the fender and door.

If you want 1/8" to 3/16" gaps, all the way around on one of these old Mopars, you need to get out a grinder and a welder.

Welding the appropriate welding rod right along the door edge is how it's done, then grind where needed.

You also need to allow for film build. A common mistake is to make all of those perfect gaps, only to narrow them more with primer, base and clear.

That's how people rip the paint edge off the door.

This can be solved by simply running a DA down the door edges before paint.