I my self am going to put a 625 on a 2366 for next fall.Bish makes all the adapters you need.for my self I might just buy a 9560STS. instead and keep my corn head.
A couble of guys in this area are running the Bish adapters. The deere heads have splined pto shafts. You may also have to get flighting extensions that go in farther to the center of the head due to your narrow feeder house. They are a deere accessory and they just bolt on to existing flighting.