i had to do somthing similar on my 35 ford truck using the same cylinder
the throw is not quite enough ,i need about a 1/4 inch more . i used the half ball from a 289 rocker for the pivot ball in the clutch release arm, it was a perfect fit. i have a 3/4 bore master cylinder and i am going to change to a 1 inch bore to see if it will throw a bit more it pushes real easy now so the 1 inch bore should not be to much different.