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There is lots of adjustment at the door hinges with slotted bolt holes and shims. Its just a trial and error adjustment to get it right. No magic tricks available. AND......if the car has never been blocked or painted, don't expect the factory to have it perfect..........there is no "perfection" in a production C3 Corvette. Far from it. If you want a perfect body, with perfect gaps, you have to make it that way or pay somebody else to do it.
Look at the gap on the door, closest to the lock strike. If the gap is extremely small, you can move the entire door forward (toward the engine). Take a few pictures of the door gap next to the lock strike.
You can check everything if you would like. However. My 77's passenger door looks identical, and has for 44 years.
These cars were Slayed by the motoring press back in the day for there poor fit and finish. Just the way they were slapped together at the factory. When your front clip was bonded on, they just could have done a better job.
My 78 was the same. The fix was replace the bushings in the hinge. That are brittle so use a socket and mallet to drive them in much like a bearing race. After that I had to remove the entire front clip and reset the underlying structure the clip bonds to. My car had a substantial amount of right front damage causing the under structure to shift aft resulting in the large gap at the top of door. It was worth the effort! This is the way it looked to begin After the paint job
