74 Input shaft 10 or 26 spline?

[Alloydude]

Getting ready to install new clutch on my 74 and wanted to stock up on parts before I pull the transmission out. I’ve heard after a certain year GM went to all 26 spline input shafts. But as far as searching for a clutch kit for my 74 I keep finding a 10 or 26 spline option. Was there a difference between the L48’s and L82’s ? I have a L48 with I believe to be a Muncie M20 4-speed

 

[Hib Halverson]

Unless someone badkdated the clutch and transmission, it's 26-spline.

 

[Alloydude]

Unless someone badkdated the clutch and transmission, it's 26-spline.

Thanks. Pretty sure it’s all original judging by the amount of road grime underneath. I think they where all 26 spline after 71 or so. I shall post if I find otherwise <o></o>