I am dealing with some overheating issues in my American Stock. I have a brand new radiator, brand new water pump, made a new fan shroud, I have tried all the restrictor plates I am now running it straight flow through. Last race it was running about 230. soon as I get off the track I hit the water hole and spray it down and it will cool off to around 200. I'm out of ideas what to try? So any ideas would be appreciated.

i am running i believe it is about a 16" flex flan, my water pump has a 1 1/2" outlet and i have a double pass radiator so i will keep the straight through water flow going. So maybe i will look into a little bigger fan. What do you mean you opened holes up in your nose piece?
thank for the help

Get rid of the flex fan.  Any other fan is better than that.  You'll see an immediate difference.

Yes get rid of flex fan. With American stock I would not use any reduction pullys 1 to 1 is best for any thing below 6000 rpm. Steel fan a must with a good shroud. MAKE SURE THE FAN IS NOT TO FAR INSIDE THE SHROUD. 1/2 IN 1/2 OUT WORKS BEST. If the fan is to far in the air cannot come off the tips of the fan and cause bad air flow through the Rad.

I ran a flex fan for twenty years.  I had only one problem.  Auto Zone sold me one that operated backwards.  Be sure your fan is sucking thru the radiator and not blowing into it.  Some water pumps are reverse rotation due to serpentine belts on later models.  If you run a serpentine belt model with an old fashioned belt, it will run backwards and not cool.

One note about running a restrictor - I read some years ago that it's always good to run a restrictor of some type. The reason being that the restrictor restricts it at the exit of the motor. Your pump is pumping into the motor, so it creates more pressure in the block than in the radiator. If you have a 24lb cap you should be making more water pressure than that in your block, and that's a good thing, because the more water pressure you have the higher the boiling point is on the water. Once water starts to boil in the block, it creates an air pocket, and that creates a hot spot and things just start to get worse from there.

Food for thought... running distilled water may be more harm then good.  Over time, the neutrally charged distilled water when running a steel black and an aluminum radiator will pull elements out of the block and end up plugging the radiator, or lessening the flow of the water in it.  Also many of the water additives recommend not using distilled water at all.  I would get soft water and use it with a water wetter (redline), or coolant boost (amsoil- in my experiences the best ont he market hands down)