A Dart GT showed up today

Jeremiah said

Are you saying the 8.75 is swapped in? Did the 273 Commando start in '65?

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The 8 3/4 was first offered in 66 and the 273 Commando was a Plymouth only engine offered from 65 to 67. The 8 3/4 would not have come as original equipment in a pre 66 Dart.