I was going to do that a few years ago. I had a set of done aluminum heads stashed in the Man Cave attic, got them from a friend at a nice price too. So when I changed up Black Beauty with the SS hood and rear spoiler delete...
I got the heads out...well they had this funny # on them I was not expecting to see
...I figred if I fliped them around enough that I would find 842 on them, what a dope, I bought a set of 074's and did not even know it
...sure glad I did not put those on my L78...Ken would still be on my A%$..
Anyway they found a nice home and I now pay more attention to what I buy.