[flipper35]

Hound Dog, all the light flywheels and any aftermarket harmonic balancers require the 360 to be internally balanced. It is a manual a833. Same as they use behind a Hemi.

Racer X, I am planning on my NASA license this year and the current engine will be fine to start. Eventually I will want more for the track.

I think to fit a 426 Hemi, I would have to run the headers some goofy way or cut the foot boxes.