On the subject of door alignment I thought I would relay a conversation with my paint/body guy today. My 55 is in pieces and he is doing minor body work and paint the end of the week. He has done at least 6 c1-c2 for NCRS judging with most being TF cars. Has had several cars featured in corvette mags so I trust his knowledge and judgment.
I raised the question about drooping doors and while not discounting a car could have weakening at the posts he opined that most misalignments are due a lack of knowing how to do it rather than any weakness at the posts or as pointed out worn hinges will have an advese effect any adjustment . His one caveat was that the car had not been hit so hard that it was twisted at the frame or the car was assembled from several cars.
His first step is to check to make sure there is no frame twist or misaligned body parts. If there is you can deal with some if you understand how. You shim the body as level as you can and then start with the door at the post. Using the hinges you adjust the gaps on the door at the post. You then get the back of the door level with the fender by shimming the front at the radiator. This shim adjusts the verticality of the posts, so to lower the back of the door you add shims to the front. You then add/subtract shims at the floor points under the seat to twist the rocker in or out so the bottom of the door aligns. If you remove all the shims at one point and it is still out you have to raise the body at all points and reshim. To deal with minor frame twist you just have to start out with enough shims on the low side to level the body to the high point. The back shims tilt the rear section but he usually tries to only use shims here to get it level.
He said it took him doing 4-5 c1s to finally figure that the above was the best way to get a car shimmed right. The one thing to say about the above is the average corvette DIY guy can do it with very little cost and if it does not work you should have a idea why it doesn’t, IE Twisted frame or the car was put together from several pieces and you have a major expensive problem to solve.
Tyler