Advice needed on manifold repair

Got this in a swap

lots of cracks

Wasn't too interested till I found out it's 68-70
340.

Isn't this the best 340 manifold or was the 71 better

Looks like someone attempted a jb weld patch on the back of the manifold

I have never seen a manifold crack this extensively

Not concerned that it will appear patched

Was this one of the manifolds Mopar copied or vice versa