I had a power steering box rebuilt by Steer and Gear (stage 3) last winter and installed it this spring. I know what a pain in the butt it is to install.
I purchased a Cold Case rad this past June when I was on the HOTROD Power Tour as they were a vendor at the destination venue on the tour.
I bought the rad as a "back up" because I my Dart was running pretty hot in stop and go traffic with the A/C on, but I managed to get through the tour with my factory rad after I swapped out the Hayden thermostatic clutch with the factory torque clutch which dropped my temperature at idle.
I bought the MOP751A "bolt in" radiator for a '69 Dart small block with cast iron water pump, but noticed the coolant inlet fitting is more inboard than the factory rad by around 1.5 inches I think, which for me will be a problem because the rad hose would now hit my A/C compressor. It also appears that the outlet port is also off from the factory rad. I also don't think that the factory shroud will bolt up despite them telling me it will. I still haven't tried to install it yet.
What is different with the rad your getting? Did they correct these issues I see with mine?