ENgine change

[TII]

The RB20det is heavier than the stock 12a, so you will notice that the front end will plow more.
It is doable, but far from cheaper than replaceing the 12a with anothere or even a 13b.

You need to look at mounnting the engine and tranny
size fo the bellhousings, will it fit the tranny tunnel?
wiring for the engine?
fuel system as you will need a bettere fuel pump to suply the fuel to the rb
ECU
clearance issues
ect ect

It would cost alot of time and money to get it to work right, but if you are motivated i say go for it. Something originaly is always good.