[Mr70]

Just got this sellers explanation and pictures.

<span style="font-style: italic">&quot;The engine block is a 512 block with cast date of March 4 1970.Car build date was third week of May 1970 at Arlington plant.Heads and manifolds check out with respect to dates and part numbers.Trans code is 1970 CW 299 assembled 2/2/70.Rear end code shows build date of 9/2/69 and matches 331 ratio.Numbers on protecto plate all match the VIN,Engine and Transmission codes.Based on all the research I have done,the drivetrain is original born with the car.Car is two owner car last 20 years.Previous owner (a friend) also verified numbers.The only explaination I have for the CW trans code is that the car was built during the transition from the L78 to the LS6 and the CW trans was put in the car.Car build date was third week of May,VIN 136370R244680.&quot;</span>

The L-78/LS-6 transition timeline was actually Nov/Dec 69.
And still doesn't explain the CF coded L-34 396/350HP specific rearend dated way too early for this car either.