The rest of the electronics will be looking for the engine controller. You would have to find a way to make it think it was still running the engine.

The gains to be had from a 440 swap would be off idle low end torque.

The losses to be had from such a swap would be everything except off idle low end torque.

As much as I love my 440s I have decided that the Imperial's 440 is the last old motor I'm building. The only reason I didn't go Gen 3 on this build was the desire for 500+ lb/ft below 3000 rpm.
There is simply too much to be gained from using 50 years newer technology.