While restored birds are always questionable, the harmonization adjustments on wartime birds as described in the Rebublic EMI for the P-47 were for yaw and pitch of the gun within the mount exclusively. At least that's my interpretation of the manual's gun mounting section.
From page 350:
(5) All gun adjustments are made from the top of the gun bay with a screw driver inserted into the slots in the adjustment screws located on the rear mount. The elevational screw is just outboard of its respective gun, and the traverse screw just inboard of its gun.
I cannot find instructions for adjusting the mounts themselves along any axis at all.
However, the real issue with raising or lowering the guns vertically within the mount, or adjusting the mount itself to support discrete vertical axis movement of the entire gun would be the need to replace the leading edge fairings at the moment of mounting the guns in any new vertical alignment with an entirely new leading edge fairing featuring a new set of barrel holes exactly-matching the adjusted gun alignment. Republic only made one leading edge fairing part for each wing, so I think this would only be possible by manufacturing new, custom-made fairings in the field after any/every adjustment. That is, if it was even possible to do. And again, there is no reference to that type of adjustment in the EMI whatsoever.
And in closing, I cannot find a wartime photo of the guns configured exactly along the diheadral as the DCS Thunderbolts guns are currently arranged.
https://i.redd.it/g5fx5vhvyw911.jpg
https://i.pinimg.com/474x/82/a9/ae/82a9ae5760ea680ad7a7247f56335fd8.jpg
https://albumwar2.com/wp-content/uploads/2018/03/03610.jpg
Thanks very much for considering this report.