Water pump rotation in a big block housing?

Well Bill,
I put my foot in my mouth, again.
I found and took the radiator to a local radiator shop on Friday. ("Hole In The Wall Radiator Repair")
I walked in and Betty was on the phone with Nancy.
So she hangs up and I told her that I had a radiator in the truck which I had already pressure checked and the bottom was leaking all across the tank.
My thought on comming in was to get a repair quote and spend the money locally by getting it fixed if it was cost effective rather than "sending the money to Mexico" for a new one .
For practical purposes, it's a total rebuild.
Betty calls a guy out of the back and tells him to go with me to the truck and look at it.
Before I thought about it, I told him the same thing.
I wanted to spend the money locally if it was cost effective rather than sending money to Mexico for a new one.
Let's just say I then noticed the fellow had an accent.
But more to the point when we went the truck and he understood that it a total rebuild and the girl did a little research I was quoted the same price that I found a new OEM type one for online.
It's a toss up.

In the mean time I looked more closely and I leaned that a 22 inch core is what I need to fit the hole in car. Someone had put a 26 inch core in the car and I didn't notice it. The listing say both sizes were in big block cars.
This car was orginally a 318 car.