It's a 1970 Mercury Cougar Eliminator. It's a Q code, which is a 428 CJ. It was optioned with the Ram Air setup. It has the close ratio 4 speed and a Traction Lock 3.00 rear end. The car was built in Dearborn on Sept. 29, 1969.
Thanks that will help.
Looking at other 70 Q code 4 speed Cougars (non SCJ) I found the color coding for that specific driveline as follows - LBOGWH
First I didn't find any real late buildsheets to compare to you cars build date all are from earlier in the year. For earlier production 4 speeds with CJ or SCJ I found buildsheets and their color coding for the drivelines are different from the your cars buildsheet shows - LXMGWH
Believe the "X" and the "M" are misprints just like the other one mentioned below. Just someone really sloppy that day entering the information.
There is a mistake in the color coding of the front shocks on your buildsheet which shows "WHITS" which I believe is a misprint after comparing approx one hundred 1970 buildsheets with white marked front shocks called out
Hopes this solves the mystery and helps