CA Early edelbrock torker 1 manifold prototype?

[396ci]

I have a used aluminum 327 intake which I believe to be an early torker 1 from edelbrock. There are no stamps except on the bottom which is 7525 and patented 1976. One outer carb stud hole has been repaired. I need to do some research on this but any help would be great.

I am currently pricing this as a prototype which may not have not been for sale but rather for testing. There are visible porting marks on it. $2500 shipped conus.