I have a Y block that was abandoned one of my renters. It had with it a set of rams horns which I did sell. Not sure these manifolds came with the engine or not. How can I tell what year block it might be.

I need to sell it and it's been dry stored for probably 35 years. It's missing intake and from cover and the pan. Heads have the original FoMoCo valves. Cylinders were partially filled with sawdust to keep dry I guess. Any help would be appreciated. I'm sure what I'm looking for is in here I just cant find it. I'm in Tacoma, WA