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.
That's why I suggested the duel or triple cross flow radiators.
The water flow will find its shortest path. With Gravity assistance the Down flow rad will more easily find a shorter path vs a Cross flow rad. Witch means it Wont utilize the full surface area of the rad. So the cross flow will cool better, but the water will find its shortest path. Therefore, a forced duel flow or triple flow will cool better. But, with the proper fan cfm flow assist, any of the above rads will work.
