Go back to the original drivetrain. Barring that, use an electric fan and get rid of the horsepower-grabbing mechanical fan.

I have a 20KW stationary generator. It made such a racket. I spent $2500 refitting it with a super hospital grade silencer and it was no quieter. A Kohler tech show me prints for a new 20KW and they were all electric fan cooled. He told me my fan was making all the noise. I found a high output radiator fan and now I don't hear it run. If the car is that modified an electric fan won't hurt. I think the 460 has a few pounds on the 368.