The 62-65 2 door and 4 door share the same body. Move the B pillar back. Install 2 door doors. Patch the 1/4 panel with a piece of the 4 door skin. Instant 2 door sedan from a pristine 4 door. Though my son says converting his 62 4 door to a 2 door would only result in a ugly 2 door.
Doug