TupperWare

So I just got a CA swap that I'm pulling out of a car. I found out that it has a bad ICM. I never knew how hard it is to find one and how expensive they are. I'm also trying to figure out what generation CA I have. Because my intake manifold goes up like a KA24E but my friends goes down like a DE. I want to know what generation mine is, and if there's any way to make an ICM from another Nissan work while using the stock ecu. Also the ICM has an arrow on it, does it face up or down? Because the car I got has it facing down.