It is sort of a poorly worded sentence but I think he was trying to say the running gear is factory with the exception of the 5 speed trans.  At least that is one way to read it. 
  
How cool would that be, serial #383 with 383 stroker motor? 
  
That car is a long way from being original.  The body kit pieces could easily be removed.  But there are a number of interior changes, like the center console has been changed and the guages are all white faced.  A resotration would propbably be prohibitively expensive. 
  
Perfect Hybrid material.