There's many threads on this here in this section--if you do a search you'll find plenty.
Carb rebuilds can really bring a motor back to life again. There are a couple of guys names you'll see come up repeatedly that do excellent carb rebuilds for a small fee if you're not carb inclined.
It is possible to take the fuel injection and head off of a 3FE motor and transplant it to your 2F, essentially making it a 2FE. Not nearly as simple as a carb rebuild. Again, lots of info can be had in a search.
The only carbs I'd ever rebuilt before was lawn-mower carbs and a 2-cycle 250cc dirtbike carb and I had no problem rebuilding the Carb on my 60. I was a little worried about getting the throttle linkage hooked back up right, but it ended up being easier than I thought.
I'm desmogging so all those hoses are like second nature to me. (Just need to cut out a block off-plate wOOt!) I marked the ends of the hoses with colored sharpies then took pictures just in case though.