Transmissions swap

I have both.
A 64 Dart with a 225 and an auto 904, and a 66 Valiant with a 225 and a manual 903. Both are stock set ups. Both have 7 1/4 rears with 2:76 maybe? whatever highway gear came standard.

Personally I'd drive the Valiant all day over the Dart. It's much quicker off the line than the Dart with the automatic. Yes you get to 3rd gear by about 30 mph but she still pulls hard all the way to 70.