The Z/28 reminds me, in some ways, of that nearly-forgotten (almost extinct?) performance era of '73-'74. For the same money as a Vette, you could (if very lucky) get yourself a Super Duty 455 Trans Am.
'Course the SD 455 T/A would stomp a Vette of that vintage, regardless of its driveline, but it was JUST an F-Body...
Prime examples of those X-code T/As (and the handfull of Formulas) go for near-6 figure$ today...or the price of a new '14 Z/28!