Toyota Tercel 84 engine Help

My car have an 3A engine and sooner or later I have to change it so I can keep using it. The engine that I can use it 5efe I hear but if it's what i need to do in order to make it work. And I mean all the mods like tranny, ecu, how to fit the engine into my car and stuff like that I no nothing excep drive. i love my car and i want to give it a new life with another engine.

Does anybody knows a thing about cars?????:banghead:

correction the engine is 4efte 1.3l