I installed a 22" Champion in my 71 Challenger about 8 years ago.
I think 3 out of the 4 mounting holes lined up perfectly to the factory ones and the final one was a quick drill/fix.
All the hose connections worked perfectly.
I never did try to install a shroud.
The radiator has cooled my 440 perfectly.
Same here on my Cuda 22" 3-row Champion 3 out of 4 holes lined up perfect drill one hole and it keeps my Hemi cool even on the hottest days. I do have a half shroud and use the window wash tank as my overflow.
