Allan907 - only one 301? I suspect that's incorrect. There was substantial modification to the airframe and systems to install the 301 series. Sure it wasn't an airtest following an engine change?
You're right about the need to watch the speed, though. At light weights, even at high level, it was only too easly to exceed limiting Mach no. On a GSU checkride with J le B on a high speed run, the Mach no jumped instantaneously from .93 to .96imn. We conclude that we flew through a pocket of air at a substanially different temp to the surrounding. The pitot static system was checked and fully serviceable. Spectacularily big anti-climax - the lady behaved perfectly!