I also have to replace the pwr steering box in my 74 Dart Sport, leaking bad. I'll put in a Steer & Gear, I had one and I liked it, besides I tried to support Steer & Gear way back when I lived up in Ohio, they sponsored the Chrysler Classic. Now I live in Texas, Shipping will be high.
Additionally I installed a Borgeson box in a 64 Dart for a guy in the Austin Mopar Club. He loved it, and yes it was pricey, but it has a smaller foot print then the old Mopar power box and he had a 360 in the 64 Dart.
Steve Cass