The guy who did it and got run off used the 2V pcm, a cobbled-together throttle body adapter to use the 2-valve throttle body on the 3-valve intake (I think, or maybe just cable setup on the 3-valve throttle body, don't remember) and found that the cam position sensor threw a code.

I was trying to work on that code with him when he got into the "kit" and got disgusted. Never figured that one out, but I suspect the clearance was too high between the cam magnet and the sensor, and the 3-valve PCM was more sensitive so it didn't care. Or, the cam magnet was in a slightly different place and the PCM was smart enough to deal with it. He said it ran good, had more power than the 2-valver. With a custom tune, who knows WHAT it could do. A small amount of machining to the face of the cam sensor bung, and again, who knows if that would have helped.

Going into it fresh, a person would have to compare the clearance between the sensor and the magnet on both the 2-valve and 3-valve, and see if the magnet was in the exact same spot, degree wise.

Interesting project.

If I had to do an engine rebuild on a 2-valve, I'd probably try it