Did you get burnt out and frustrated with the 727 while you still had the blower on the car??
Even a slow heavy car is hard on the trans. with a roots style blower.
IF anything is deficient in it the torque. fails them quickly.
Even my 11-0 streetcar has taken out 3rd FOUR TIMES.
Finally got it sorted out.
IMO with the blower forget horsepower, worry about the torque.

Your car, your effort your money and choice.
Hope you get it how you want it...👍