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Most 4 Ks are fuel injected (in USA) The LEC could be carbed or injected with 16 valves. You would have to compare base gaskets to see if they are close. I used to do swaps like that back in the '70s and '80s but that's so long ago now. I even used 2 3KC carbs on my 3TG motor (twin overhead cam hemi from Japan)
i havnt worked on a yugo in years....undo all 3 bolts on the front and the one at the back of the alt and remove(leave the belt in place if you want to)
then just lift it out,you will see that it has a long "arm"this is for belt adjustment when replacing the belt,to tension it. 1/2"play on the longest run.between pulleys..
check and replace the fuel filter on it. if if has been pluged up for to long causing the engine to run lean for too long it could have caused catelist problems too. if both are fine check fuel pressure and check the fuel pressure regulater,.
If it is an electric pump, there are probably even generic brands that would supply the required fuel volume and pressure.
If it is still mechanical, it is likely the same pump used on any variant of that engine such as the old 128 or Yugo for example.