radiator question

[dedjr67]

I put a 283 in my 65 in place of the 230 and the radiator even after being recored witha 3 row core just does not seem to be cutting here in Florida. When at a stop light or on the highway going over 65 mph the temp starts to creep up to around 200 then I get nervous and either slow down to 55 or pull over. If I keep it around 55 to 60 never goes over 170 degrees. I am running 185 degree thermostat 2000 cfm electric fan no a/c manual trans. What is a good aluminum rad and what size will fit our trucks.
Thanks Dennis