Thank you I thought it would add mass behind the face, so I lined it up so the rail sat right on the cross section.
I have got some plans based on threads I have read to make it into more off a swiss army anvil.
I thought of putting a fuller on the webbing, a bick and then on the other side make a small turning fork. Then because of the light weight use it as my demo anvil to show people you don't always need a London pattern anvil to get started