If you get hard-up enough, you can make one (although not cheap). Either thru YearOne, or look on FleEbay, find both "440 SIXPACK" (from a 71 Charger)and "340 FOUR BARREL" (from a 71 Chally). Between the 2, you can make your "340 SIXPACK". Both are the same number size-the 6pack letters are larger. Check our part #FD40D and FD40E in YearOne's catalog.
It worked for me when I f'd up my Hemi'Cuda emblem for the shaker.