[sdk3k]

I believe it should be a 3:23. I read somewhere that 3:23's were used in AC cars.

[Baron Von Zeppelin]

10 bolt is right
Safe-T-Track is the Posi
37G is axle code = 3.23


71P / 71C = PC = G70 x 14 Redline Wide Oval Tires

Center caps would have been Black with Red PMD letters
Lug Nuts would have had Black centers
Wheel code by valve stem likely JC - or maybe JA

Custom sport st.wheel was simulated wood.
Custom shift knob was wooden with GTO crest.

Pwr Top and Pwr Ant switches would hang in dash just below dashpad poking through the top of dash bezel.

Not sure if there would have been an extra switch for rear speaker with the Stereo radio - but would have a rear speaker. Think stereo unit had a separate multi-plex or amp hidden up in dash on passenger side.
AM/FM dial switches up and down with far left and far right pushbuttons. Pushbuttons would be chrome on 68 Stereo iirc.

64 and 68 are not my strongest suites.