Not enough information dude to give you the right setting. We need to know what engine size and induction setting it is, also the year of manufacture. There are half a douzen setting for different engines. 1L or 1.2L? 4speed, 5speed or auto? Carb with manual choke, carb with auto choke, or ecc catalyst model? There is no magic number that suits all engines.
1.2 5speed with no cat and auto-choke is 0 degrees (TDC), the automatic is 2'ATDC. The 1.2L 5speed ecc cat model is 4'ATDC etc etc... put up some more info dude. But to be perfectly honest if the car is running right then i would leave it as it because it's already correct. Only if it's sucking fuel down heavily or knocking on accelaration is it not set right. (and that's assuming that everything else is in perfect working order and has been regularly serviced, e.g. k10's loose power and become very thirsty when the air-filters get dirty. So you can easily mistake one cause for another).