as I understand it the yugo also had the injectors at a slightly different location which means you have to have the head cut to fit them there...
so basicly you have to go with the entire yugo top end... which isn't nessasarly a bad thing as it'll bump your c/r a good bit (.5-1 as i recall)... :) i figured megasquirt the fuel bits and keeping the stock dizzy would be the easiest way to go... but i had to get rid of my yugo and haven't found another in my price range (read darn near free) at least not yet...
that being said... i've only ever seen one yugo in a junkyard... they'd used it as the yard parts getter... cut off the back 1/2 of the car to make it into a mini truck of sorts... something they seem to do with LOTS of the cars that come into the yard that still run... and when they are done they just set em out to die... but that was years ago