Those look to be very nice. I am leaning toward a downflow radiator as well. I noticed something a while back with my howe crossflow radiator. I had the cap off radiator and moroso pump running while watching coolant flow. The top 3 rows had no coolant running thru them at all. Coolant level will always be lower while running pump, so wouldnt a downflow make more sense as all the cores would be full all the time.