They made about the same number of Z06s as L88s.
I bet that was more to do with price of the L88 motor option. Same with the ZL1 Camaro. As well as the fact they under rated that motor to 430hp so that on paper the other engines produced similar power for less money. So many probably figured it wasn't worth the extra cost. But only had they known the L88 was more like 550hp.
Let's say in a magical world that looks like 1967 USA. You are in a dealership and were looking at a Corvette and price was not a concern. The dealership has both a 63 tanker as well as 67 L88 car. Both new on the showroom floor. Are you saying you would tank the 63 tanker over the 67 L88? Because it is the better car? A 340hp sb car with a big gas tank versus a 550hp 427 corvette with disc brakes? As a street car, not a race car. Because I don't think the article is talking race car pedigree as it leaves out some serious vettes that were race cars.