I have a 83 GMC Jimmy with the 465/208 and I am sure it has more than 10 on the ouput shaft. I would think from memory it has 32. But not sure. Sure however, NOT 10.
My .02
John
'83 GMC Jimmy 4x4 ZZ4 Crate Motor
'84 Chevy P/U 4x4 Sand Drag Racer, 578 RWHP
'94 Impala SS
'93 Chevy P/U 4x4 454tbi