2 vs 3 v- groove power steering pulley

[Sgt Gus]

So the '87 3/4 ton, 454 has a 3-groove power steering pulley. NOT coming off.
Will a 2-groove for the saginaw work and line up? The back v-grooves are approx 5.75" diameter. BThis truck was not using the front smaller v-groove 5.125 diameter?
Press on, remote reservoir, new one on the way.
Now I need to order a pulley.

 

[ali_c20]

Do you have a pulley puller tool ?

Which groove of the crank pulley was used ?

Rockauto shows a single and double groove pulley for your truck.

https://www.rockauto.com/en/moreinfo.php?pk=12729793&cc=1059982&pt=7381&jsn=990

https://www.rockauto.com/en/moreinfo.php?pk=12729797&cc=1059982&pt=7381&jsn=989

I would wait for the new pump, test mount and look how everything lines up.