It has been a myth to this day why they only made 6 or 7 {67} Chevyll L79
Here is a factory order sheet for 66 and 67 Chevyll
66 Chevyll with L79 on order sheet
https://photos.app.goo.gl/Tbn8T16K8eKw8q477
https://photos.app.goo.gl/NFPkLoUXeNGXnNuM7
67 Chevyll without L79
https://photos.app.goo.gl/87cUB7aeDFXcydYW6
Here is Jacks 67 Chevyll L79...very rare car. One of 6