[XXXGoldL34M20]

IMO I don't think all these parts are NOS but the Borg & Beck Pressure Plate is like new, the Flywheel is like new and I think the Veelok Discs are in fact NOS as the white letter stamps still show clearly (If used these would have been gone IMO).
The Flywheel may have been used for a very short while as it shows evidence of the cranks impression. (See Photos)
They are definitely all TRUE GM parts as the stamps on the discs coincide with all the 3959176 course ten spline parts ever shown for this set up.
Flywheel has part number 3963543 which is correct for this set up.

The 1969 Corvette had the MA6 Option come out in April of 1969 and just over 100 Corvettes were ordered with this set up. The L71 427 435 HP had a code LT were the 427 L89 435 HP with Aluminum heads had no distinct code for this option. There are 2 sets currently on ebay and I linked both of them in the next comment for comparison and you will see everything I have here matches up just fine for a TRUE MA6 set up.

$3500 USD or B.O.
Shipping $100
Paypal "Friends" only.

Danny Donald Tarquini