22” radiator, do they keep up

As was said earlier , a 22" rad will cool your Hemi if you select the proper one . The right accessories need to be employed as well . A 4 row will not necessarlly cool better than a 2 or 3 row . And a 3 row might not cool better than a 2 row . IMO, it's the size of the tubes and the spacing that is important . A shroud is necessary along with fan(s) (electric) . Gen III's run a little hotter than LA or Magnums. FYI, Griffin is the only vendor that I have researched that guarantees to cool your ride . At $788.00 they should . Good luck !