Thanks guys. I think I'll leave the edges.
This makes sense for almost all anvils, I've even been told the factories started rounding the edges on later anvils instead of leaving the 90. I can always make a hardie or specialized a piece of railroad rail for that.
However, I do feel that welding up the heel would restore this thing to it's original glory. It hurts my brain to see such an awesome anvil left like this if it could be restored.
So i'm curious Frozenforge, you've already said you'd leave it as is, but is that because you think the finished repair won't be done well (I'm a decent welder but don't have much experience), or that a repair done well isn't worth it?