Salam Poster. I have owned the same car u have in original petrol 1000cc engine and honestly speaking it sucks in terms of pick, power and consumption. i would suggest u to put in 4A-FE 1.6 engine and as told u above it is best money can buy in terms of parts availability, every roadside mechanic will get his hands on it happily. Moreover in terms of power its great engine.
Plus one thing you must keep in mind if you get a 1.3 carby engine it will give u the same consumption as 1.6 efi engine will provide to u. But in terms of power there is a hell of differene. Plus starting issues in a cold winter morning will remind you the reliability of 4A-FE.