A833 /904 7290 Slip Yoke

lemondana said
I thought the 67 A body was the large one also, but since they used the small spline A833 behind the 1966 273, they possibly could have used them behind the 67 273 also. I'm not sure.

Yes, '66 and '67 still used the 25/26 spline slip yoke unless you had a 383 engine. Those came with the 29/30 spline yoke.