History of LD340? Which one first??

Hi all.
I am building a 340 and want to use the "period correct" version of the LD340 for 1970.

I know there are two different versions of the LD340 floating around - one with and one without the Chrysler part number.

The earliest reference to the LD340 I can find is a Hot Rod article in September 1969 called "Mopar Manipulatin' " where they fit the "new LD340 (made especially for the 340-inch engine)."

Can anyone tell me whether the LD340 as released (ie in 1969) was with or without the Chrysler part number? At which point was the second version made? Were they sold side by side?
thanks
Rob
Australia