A Dart GT showed up today

Neither the 8-3/4 or the 273 four barrel were available in 1964. A "Commando" was NEVER available in a Dodge...just like a "Magnum" was never available in a Plymouth...
Right. Beat me to it. The 8.750 is a transplant, but a dang goodun. Neato car! Keep us posted on what you decide to do with it.