Sorry for the delay but I was just looking up your car and I was looking at a shot of the engine and I must say that it look a lot like the 6G72 that goes in the Stealth and the 3000GT. I'm guessing the block is the same but the heads are certainly different being SOHC 24v.
Hell, even the MAS looks the same. I think it has just been turned around.
I guess the golden question is, how much power do you want to make?