Early 327 engine information gurus?

[A1971Blazer]

My buddy was going to scrap this old 327 that has been sitting on a shelf in his shop for 10 years or more. It was in a 64 or 65 El Camino that was driven here from Montana.
He gave it to me...
The casting number is 3782870 and the only stamping on the front pad is SA
The picture of the casting number also shows the end marking of the cylinder head(s).
I'm thinking of using this engine in my Grandson's 68 rather than the healthy 350 that it has now.
I think this is the 250 HP version but not sure ?
I'm wondering about adding a power steering pump and looking for info about the brackets and pulleys that I will need for the short water pump set up.