Agreeing with ALL that has been said below.(pretty much)
EVERYTHING I have heard on here and RPM is about the same. A new "off shore" radiator probably WILL NOT fit in with out die grinders,hack saws,"cussing",shipping some back,ect.
I would personally get mine re cored. The trick is finding some one near you who can do it???? If you have it re cored and have to ship it out of state,you might have to take out a personal loan to finance it????