I'm curious about a set of heads I had offered to me today by a buddy. He had them reworked years ago and discovered he still had them but knows nothing about them now. I don't see any identifying numbers like my dove heads in fact they don't have any markings except the numbers 45 right by one of the spark plug holes. They are iron heads since they have some surface rust and i'm probably just gonna pass but I was hoping that there might be something to them since he took the time to prep them at some point.

Does anyone know what they could be?
Seriously there is nothing else on them besides "45"

Yes they are ford and i just took a pic of the numbers that were there.
I was really just making sure they werent something like super cobra jets or something really sought after since i told him i didnt need them.
I just thought it was strange to have no casting numbers at all