All I know is that 4-2-68 was my 10th birthday! Looks to me like an E to me too. Interesting thing would be to find out when they did start machining the pad, might be a left-over block that was supposed to be used for a 68 model car but was in the back of the queue when the 69 model year started.
The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.
Looks to me like an E to me too. Interesting thing would be to find out when they did start machining the pad, might be a left-over block that was supposed to be used for a 68 model car but was in the back of the queue when the 69 model year started. 
