At cruise settings, the Mustang has more than enough thrust developing to do the full range of aerobatic maneuvers without even breathing hard.
When I flew Crazy Horse Lee had me bring the power up to 46" and IIRC 25 or 2700 RPM which is what we used for climb power, this was for the Cuban 8s, loop, vertical 1/2 roll. Earlier we did rolls and wing overs at cruise settings.
Any airplane can do acro at cruise power, in some you'll use lots of alt to provide the energy needed.