Outer Limits 4x4 Board

i have a fj73 with the 3f petrol in it just wondering if you can convert to efi? any help would be good

Dude, the later 60 series and early 80 series had 3FE engines which were basically a 3F but injected. You could probably swap the heads over but by the time you do it, wire it/install it/ tune it, it might be more cost effective to sell your current 3F and buy a 3FE from a wrecker. You would probably be looking sub 1K for a decent one (Im no expert though). Should be a straightforward swap. Then again if you are going to pull the engine out, fit a 1uzfe V8, Same capacity, heaps more power. Up to you though.
Hope this helps, good luck.