You have to remember as well that the Hemi's had the inverted shock towers where the Max Wedges did not, so they could not be "leftover Max Wedge" bodies. This wouldn't even be possible if you think about it. The cars came down the line with every other Slant 6, 318, 361 and etc. They were not sequentially tagged.

The only reason I could see these cars being built is to sway Nascar, since the teams were running hardtops in '64.