Then again....
Now I have looked it up the breakdown of figures for 340 convertables do not exist.
As mentioned already above, Chrysler lumped the 340 hardtop and convertible figures together, so we don't know how many of each were made or how they brake down into auto/man trans.
They only separated out the figures for the 383 big block. The 440 and 426 not being available in the convertible that year as there was no R/T version.
Well who cares eh? Still a fine and rare car you have whatever the numbers were.