1965 4-barrel intake

I also don't want to add too much rear gear if I want to take the car anywhere distant. 3.23 is what is in my white dart now, and that is about max for highway driving, as far as I am concerned.
3:23 is perfect I think, In my 65 Dart 273 904 I’m at about 3000rpm @60mph. Yes the D4B is aluminum. Dustin