200 degrees is nothing to worry about.  When it starts going over 215-220, then be worried.  My overheating point is 230.  My 454 runs at 185-190 in the heat & humidity of NJ.  It has a 180 stat and a stock 7 blade clutch fan with a stock 4 core radiator.  My 350 in my 86 Cutlass is the same way.

Tom

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