Downflow VS Crossflow Radiators

I have a cheap jegs 2 pass cross flow with a high flow water pump with a diffuser plate built into it,run a 180 deg stat,a pusher fan behind the grill,never hit 200 degs in 105 degree weather,thats with 440 and 6-71 dyers blower, that radiator and try y headers were the best mods done in my 33yrs of abuseing this car,