'65 Formula S with "factory" 727 and 8 3/4?

Jim Lusk said
I forget, was yours a known 7-1/4 or 8-3/4 from the factory?

8 3/4 Sure Grip. 3.23

Jim Lusk said
Also, I'm guessing that the "99" pinion might be that it doesn't have one or ???

Could be. They probably didn't have a Speedo gear for a 4.56 rear gear. Lol