I just read an interesting article about 426 and in the article they mentioned that they were thinking about putting the 426 in the ’66 300 and calling it the 300M. They were going to produce it in very limited numbers but decided it would have too high of a price tag. They said there was one prototype made but I have done a google search and found nothing.
Just the same I would love to have a ’66 300M with a 426. I found this original emblem on ebay they only want $695