Well this conversion has been done a million times so doing a search on the forums would help. But just quickly.
Get your FWD 4AGE
Buy all the RWD bits you need from a wrecker of a 4AC or you could get them for free of some wreck. You'll need the water pump and fittings for the cooling system off the 4AC at least and off you go.
Oh yeah, don't forget to put a spigot bearing in the crank.