Andy,
Have you actually test fit anything in the rack yet? The lock itself looks a little high, and maybe a little on the wide side (it could just be the pic, angle, etc). CHP angled their racks backward a bit (towards the rear of the car), and I have a feeling it was for clearance.
Your car is definitely coming along.
I'm working on making a diagram/pattern for both styles of shotgun racks...'82-'86, and then '87-'93. Jim Y. are you listening??