If you’d have post this thread before swapping, then no one would ask you change it.
2JZ is powerful engine and exactly suitable for the weight of this car.
In the crown, at-least 2800cc or 3000cc engines works good.
2400cc engines have to work so hard to move the body of the car and sometimes these are terrible with the load.
The best choice would be to replace it with 2800cc engine or same with 2JZ.
BTW, where did you do that? In Bilal Ganj? Share the cost also.