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?