Fantastic looking build! One of my favorite Mopars, too. You've done a great job on it! I just picked up that very same kit the last time I was in the States.
In addition to echoing Doog's good advice about detail painting the wheels, I might also suggest using a narrower gauge of wiring for your spark plug wires next time. I see this in quite a few builds. In this scale, those wires would be about the thickness of garden hoses! Was that an aftermarket pre-wired distributor, or did you add the wires yourself? In any case, I'd go a little thinner next time.
Still, it's a fantastic build, in a great color! Looking forward to seeing your Challenger!