I only lived a few blocks from Yanko Chevy where I grew up. Yanko was a small town hole in the wall dealership near a drag strip called Pittsburgh International Drag Way where Grumpy Jenkins was racing one bad ass Chevy II with a 302 in it. In any event, I remember them talking cams as advanced and retarded and then lobe split from 108 degrees to 114 and anything in the middle. As a result, they can take a stock L82 cam used from 1957 to 1982 and play with those 4 specs and still stay stock. I am sure Ford realized that if you split the cam in two and put cam Phasers on the end, you can adjust at will those specs. Make it smooth with high torque on one end and high rpm and rough idle on the other. Thus a Ghost Cam. I guess you could lock the Phasers and design the engine to one RPM range. For sure the Gen I engine has different Cam and Phasers then the Gen II. So a Gen I engine is not interchangeable with a Gen II Coyote Engine as far as the ECU is concerned.