Dear 54PU;
Everything was 10 spline back then.
The Saginaw & Muncie used both 10 and 27 splines depending on year/car they were used in.
All you need is a 10 spline (imput shaft)one & your "all set" as the clutch disc/bearing/bell housing will work as-is.
Get a yoke to fit the back when you buy your trans. That & the drive shaft lenght is all you need change.
Good luck, John M......
