I had a 1976 FG-430 head that you changed the mounting hooks and added a filler plate to use on a F2. Around here cutting up a head won't gain the cost of the gas back let alone your time.
My corn head manual shows attachments for a black 6 row on an F2--a look at the hooks and lower slot spacing should indicate that---you will also need the throat narrowing kit and dual drive adaptors---plus lots of weight for the rear end. Ben,