Very nice car, glad you're happy with it. At 430hp/500tq the 440 must be a pretty mild build - nearly stock. Easy to bump it up from there and retain good street manners if you choose.

The one thing I would change, in addition to what you have planned, is finish off the tail stripe so it continues onto the valence. They end up like yours when the car gets the stripe added without the valence installed. It's supposed to seamlessly transition from quarter panel to valence and continue on down to the lower edge of the bottom rear body line. Sorry if this has been pointed out before, but this is a major pet peeve of mine regarding the '70 Dart tail stripe.