Sorry to respond to an old post.
As I was going through the pics of the A66 body tags posted, I noticed that the FE5 red 340 car was built the same day as mine A06 October 6, 1969. (70 Challenger A66 convert-yellow automatic) Interesting point regarding the sequence numbers for two cars built the same day
Mine lists as 152571 and the FE5 car lists 152499 (hard to read last two numbers) Either way the red car was just a tad earlier then mine by the sequence number for the same date. The EK2 car was built just a little later A13 (October 13, 1969) with a sequence number of 157850. Everyone seems to examine this type of data. Very interesting to examine and assess. Specific to my car with all of the postings, mine still has the 340 decals on the power hood, argent grill, no wheel moldings, with the black bumble bee stripe. 15 x 7 rally wheels with the E-60-15 sticker still in the door jam. Also has the front and rear sway bars.