we have this car, simple DX, in family (relatives) since 1982 and bought by my father in 1992, needless to say what the car is, its original engine is sufficient for daily use and and some what economical, but if you are impressed by youtube videos, then definitely you will need a bigger engine, people has transplanted bigger K series, 4afe, 4age, JZ, 3S engines with modifications,
We have overhauled its original engine twice till now, and are satisfied.