A kind advice here. If the car was your dads and you have nostalgic value for it, then just restore it with slight body mods, rebuilt the current engine with webber carb, redo the interior and add nice wheels. You can give it for your next generation.

For drift car, its going to be trashed. So saying its your dads car given to you and you wanna keep it does not make sense. I do not know how many drift cars you have seen, but all of them WILL and i seriously mean WILL get banged here and there. When you drift cars, you cannot be careful. No such thing as being careful when you drift. Also that Datsun platform would not have many parts for it anymore. And having leaf spring at the rear is going to be a real headache to set up the suspension and lowering it and maintaining. Not to mention finding the axle with LSD for it.

Sure u can get SR20DET stuff quite easily. But remember what was said about accidents? Try looking for the metal bumper or lights if they are broken. Once u crash it, the car will forever leave you. All that dads car sentiment will dissapear leaving regret.

I guess u mistaken the modern FF platform Sunny and the old FR platform Datsun. If u think of making a FF platform Sunny to FR... i can only say good luck. Very very good luck.