A T series engine will take a T50 easily. A K series engine will take a T50, but it will need a rare bellhousing (depends if your talking to Taz or not :y: ).
If you want a 5 speed for this, you will need a K50. Now a K50 from a KE70 won't fit properly. You will need to cut the shifter hole in your cabin. Therefore you want a K50 from a KE55 or KE30 so it lines up all nicely.
Are you doing the engine work yourself? Or are you getting someone else to do it?