Hi Wayne,
I am not an electric guy, but the conversion should work. Getting air cooling for the battery and ESC will probably require some modifications. Any of the current electric motors used in pattern today will provide all the power you want. One other consideration is ground clearance. The 2+2 was design for retracts and probably has enough clearance for maybe an 18" diameter prop (at most depending on wether you fly from grass or pavement).
I would recommend contacting Mike Mueller at F3A Unlimited. He has flown pattern for decades (glow to electric) and probably can make some suggestions for equipment, etc.
Good Luck! The 2+2 was a very nice flying model.
-Will