Check out Stockton Wheel, their site shows rallye wheels available with a 5 on 4 pattern, as well as a Torq-Thrust 15" in 5 on 4.
http://www.stocktonwheel.com/
I've got a Firm Feel "Stage 2" box in my '74 Challenger, and it's a vast improvement over the stock box. I would not hesitate to go with them, in fact, I'll probably use a stage 2 box in my Dart, when I get to that point.