What kind of temp gauge are you using?
Does it ever overflow into the puke tank?
Move up to a new 18 pound radiator cap and replace the t-stat with a 180, or even a 192. Stant levervent caps are usually good, and are what I would recommend, but Stant t-stats suck eggs, and should be avoided at all costs. I recommend an OEM Ford t-stat, as it's one of the only ones available that has a built in bypass that permits "burping" of air pockets.
Take care,
-Chris
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