Slip Yoke for a 727?

I am trying to source a slip yoke for my new 727. It has a 30 spline output shaft. My 8 3/4 takes a 7290 U Joint so I was looking to do the same thing at the front end of the driveshaft.

I thought this would be straightforward, but the only piece I can find is at Jegs - an Inland Empire SY-727-7290 which specs out at the 30 spline and accepts the 7290.

My concern comes from the fact that everywhere else I look I am seeing different (29) spline counts or different yokes like 1350 etc. so I have no other options to compare to.

This will go behind a 458HP 408.

The Jegs webpage says "material: Cast, OEM Quality" so I'm wondering if this Inland Empire piece will fit the bill, should I be thinking of a different U Joint style or??

In the words of Lawrence Welk: "Thank you Boyz-a"