I called US Radiator, told them what I am running and they have since built 2 custom radiators tailored to my set-ups.They know their stuff and I had very good customer service from them. Neither car has gotten any hotter than normal, ie 180*. I do run shrouds and thermal clutch fans properly spaced from the radiator. I tried running the SPAL twin fan set-up with controller on my e-body and it worked too. I ended up going back to the factory style mechanical fan just because.

1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)