I've seen it suggested to drill alignment holes in door hinges prior to removing doors to ease realignment when they're reinstalled.

So, do you drill through in to the body or in to the door? Both hinges I presume ?

Which ever half of the hinge that you are going to remove/unbolt. Maybe both into the door, and into the frame, if you want to. And yes, top and bottom hinges.

Yes I use 2 1/8" holes in each surface. However when doing my 64 Belvedere it was IMPOSSIBLE to drill the upper hinge at the A-pillar surface. I tried carbide, no go. The lower hinge and the door side of the upper was no problem.
Doug

Makes reinstalling the door so easy.

Most hinges you can't drill as they are too hard. I have tried this many times. This is also using a very high quality drill bit.

It is a great idea though.

Are your doors aligned really well now? Are you going to rebuild the hinge bushings?

If yes & no, and you aren't repainting it; you can also use a Sharpie to mark the hinges and get pretty darn close to the way it was. Probably as close as drilling holes in your car if you are careful. Carb cleaner will remove the black ink when done.

Can you knock out the hinge pins and leave the hinges bolted to the car?

Just some things to ponder, Stanton.

The car is being completely stripped and blasted.
The upper hinges are being replaced - thought of doing that now so the lower hinge keeps the door in place.
One door will be replaced so I'm wondering if there's any point in drilling the hinges on that side.

I wonder what the pros do ??

I'm no professional, just a home garage guy. Line up the new door. Add weight in the door to simulate the regulator,glass and trim. Temporarily install the weatherstrips you intend to use. Then drill. Makes it easier when it's all painted. Less chance of parts hitting. You'll still have to move it a little. Take your time until you get the results you like.
Doug

You can also use a scratch awl to mark the metal..