I can understand if he already has a 7m kit and just bought a 2jzge ....... If not his an idiot...... For not thinking about the path of least resistance.
You would need a different manifold to fit the 2jzge head. Everything else SHOULD be the same consider they are both straight 6's, the injectors are the same type, the intake track runs the same, etc. ..... again SHOULD be fine.