Looks good!

Did you ever check the amp draw from both fan assembly's?

At one time I tried a 1992 Camaro electric fan.
It drew a lot of amps, IIRC 20-30 AMP range, killed my stock low amp alternator.

It was not the correct set-up for sure.

Was wondering if you ever talked to anyone on how far a Sprint engine would actually make power to?

I am thinking you are trying to go past what the camshaft actually makes power to.
Just a thought.

Good luck on the road.

MBHD
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12 port SDS EFI