kim3, I am intrigued by your concept, and reviewed a couple videos, so questions:
You are running 636 hp 2WD, not awd?
FFR recommended the motor in front of the axle, but that would require running the drive in reverse, and the lube system will not allow that?
So, you will have a rear weight bias and lots of power. You know about snap oversteer I assume. Have you predicted weight and distribution?

I intend to repower my 818, electric is looking good.
Are there other motors with drive behind the motor? A cursory look suggests hybrid rear axle motors are kinda puny.
With your research do you know of a motor closer to 300hp?
thx, jim