If your project is 24p then you are better off shooting 24pN. You could try shooting at 36,48 and 60fps. If you shoot 60p you would have to re-conform that footage to 24p anyway.
While we are on the topic….
If you have the ability to shoot 24pN at 60fps with the HVX why??? would you ever want or need to shoot 720 60p???
I understand with the VariCam you have to shoot 60p to achieve better slo-mo but shooting on P2 why would you want to shoot 720 60p??