[sixbrl440]

I'm not an "expert," by any means, just a guy who has, back in the day, owned a few of these cars. There were, if memory serves me well, three different styles of 427 emblems used on the '68 front fenders.

1) "SS427" with the SS above the 427 numbers, both the letters and the numbers in a panel ahead of the marker light. These were the "early production" markers.

2) "427" with the numbers forward of the marker light. These were the "late production" markers.

3) The "427" rearward of the markers, with the red background, were used on Canadian cars, I have discovered. This may not be exclusively true, but all I have seen configured with the red background and with the numbers to the rear of the light, have been on Canadian cars.

I don't know if this will help your understanding, but the callouts really have nothing to do with whether the car has the L-36 or the L-72 rating.