Here ya go Ulf. These are 1967 covers. @CudaChick1968 had these pictured on her site. I see the holes for the spark plug wire insulators. If you look carefully, you can see the slot on the right side of the top valve cover on post#1 (last photo)
I totally agree with you Toolman! Between the place for each ignition wire you can see that square hole for the insulator. But wasn't those insulators on 66 as well?
