Moe,
Here is the same question I posted a long time ago and Ohmster from the factory chimed in around link #16. Read through the thread.
Neil
But if you are bound and determined to do it you would need a carb, intake, a new airbreather backplate if you have the BDM cover on, intake seals, check valve, VAC hoses, throttle cables, coil, coil harness, spark plug wires, EHC, power harness, ignition module, mod the fuel tank with a petcock and repaint the tank. Personally, I do not think the EHC needs to be changed out or the factory does not want you to think they are compilable. I gave my EFI, EHC to a friend with a carb bike to use.
http://www.bigdogbiker.com/forums/efi-topics/3596-so-what-does-take-convert-carb-efi.html