I searched, I must be using the wrong words.

I live in MA and MA is a pain to get kit cars legal which is ironic due to FFR being in MA. In MA it seems much easier to get the car on the road if the engine/trans came from a donor car. If I bought a 5.0 coyote mustang and harvested the engine/transmission and ECU would it work in a complete kit from FFR? Will the mustang ECU throw a fit due to no longer being in a mustang?

Thank you.