on my r/t I've found very little change in temps with different fans; almost nothing there. the water pump did make a difference. 4 row radiators make a difference, but currently i'm using a 3 row (factory was 2 row with only 76 tubes!!!!!!!). cast iron exhaust manifolds will easily go 700-800f at their outlets. all that heat has to radiate/ transfer somewhere. unless the 22" radiator has a good core with a bunch of tubes, air circulates under the hood easily, they'll always run on the warm side with a big block. I have a '65 coronet with a 4 row brass radiator ( 204 tubes), tubing exhaust, 6 blade pump with anti-cavitation, good air circulation and it never runs hot.