Hi,
Having studied the Prius systems and followed the Honda systems, there is more involved than just adding an electric motor to make a significant fuel savings. GM's 'micro-hybrids' have shown you can pay a lot and get next to nothing in mileage improvement.
You have a lot on your plate with the engine swap. Perhaps get that done and tune the vehicle. Then we can address the more complex problem of adding some type of hybrid drive.
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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