first of all happy new year to all !!! i need your experties

just broke my engine due to broken bolt of the secunia which hold the timing belt..my engine is lancer 99 1.3L (carb)

1. would you recommend over hauling considering the cost?? and how much it will cost??

2. replace with japan surplus engine? can i get the exact engine details of my original?? how much is the engine??

3. if ever i replace the engine is it possible that i use the injected type??would there be any problem with the mounthing?

4. how much the engine replacement at LTO?

thank you so much. i badly need your help.. this is my only car with a tight budget i have to plan everything ..i am a fan of this forum and very happy that many of the members do helps!!! MORE power to tsikot and MODERATORS.