ok, so no matter what you do to the fan and shroud combo, no matter how good, the coolest you'll run on the highway will be 200 with all else being the same.
So you have to look at all the suggestions offered like timing, new motor break in, radiator, clogged block, lean/rich carb, water pump, rear gear ratio etc if you want your highway temps to get down under 200. bear in mind, you don't need to solve all of the above. In fact, you'll probably only have to solve one or two of the above to get under 200.
