If this 460 has a Distributor, I think it has to come out of the Engine (watch TIMING!!!) then the Shaft has to come out to change that Module. Unlike GM, Ford drilled Gear and Shaft once assembled then drove the pin in. So, MARK the parts so you don't go together 180* out and have trouble lining the holes back up for the pin. Ford gears were hard to pull off, too. I found my Snap-On power steering pulley remover tool could do it. There's a fair-to-good chance the Gear will break, so have one or at least source it. I only broke a gear when I didn't have a new one nearby. I think the Old Gear knew it...