On a previous post I was trying to figure out the engine. I couldn't find the head ID numbers.
Found them on the drivers side, facing firewall. I'm guessing the heads were pulled at one time and not put back as original.
I used a mirror and snapped a few shots with the phone.
Here's what I came up with; W354099G
Am I reading it correct?

 

Do you have your POP booklet?

 

No booklet

 

Ok, I think it's figured it out W= '66-'67 330
G= High Compression