well the 300zx that i was "selling" to my friend is now back in my hands. he never paid me after a year of having the car and my dad wanted it so i went and got it its been having alot of issues and i figure it will be cheaper and easier to just swap a whole new motor in it then fixing every little thing 1 by 1. what im wondering is. should i just throw another vg30et in it or maybe an sr or rb? how difficult are swaps in this car? also if anyone has any good links to where i could buy said motor.