Now that summer is on it's way, I am thinking about making additional improvements to my TBird's cooling system. I already have an aluminum radiator and electric fan.  Made a big difference.  There are a number of additional modification available. Casco sells a water pump with deeper fins.  I believe this is to compensate for the TBird spacer.  They also make a smaller water pump pully which is supposed to improve flow at idle.  I have also seen an improved spacer. My issue is only when sitting in traffic on a hot day.   As soon as I move, the temp returns to normal. Any input?

To be honest, I don't know how hot my engine actually gets.  I never have any temp issues until the heat of the summer.  Even then, it's only in traffic on 90 degree days.  My SW temp gauge reads 170-180 degrees normally. This matches my 170 degree thermostat.   In traffic, the needle goes past the 180 degree mark, maybe to 200 or so.  I have never let it go any further, so I don't know what would happen.  I have never experienced any steam or over coolant overflow. Perhaps my worry is unfounded?  Did I mention my block is .060" over?