Who was making ignition insulator on valve cover

That's because both are 67 273s.

Op was asking about 68.

I chimed in with the 67 covers because they might have been the same in 68 but others had called BS about the 67 having two different types of insulators.

So I posted the second pic of the car that just arrived in my garage today with the same insulators as I was talking about.

It's all good.