k10 big block cooling problems

[dieselfuel007]

i have a k10 with a mild built 454 thats having some cooling problems at idle the gauge runs straight up going down the road but if i let it idle it starts to run over on the hot side of the guage i've used a temp gun on the thermostat housing its around 200f when the gauge shows it hot but when shoot around the sending units its 210-215f . this is what i've done so far 7 blade fan gm heavy duty fan clutch repop big block fan shroud new 16 ibs stant rad cap added recovery tank timing is good carb runs alittle rich also it has a wieand aluminum short water pump short and the fan is half in the shroud it has a 4 core radiator that was in the truck when i bought it i really don't want electric fans either