I have a 351C 4V in my 73 Iso Fidia (Italian sedan). Engine is stock (except for Edelbrock intake & carb). It has a re-cored rad, new cap, high-flow180 stat (Milodon 16401), and I have just replaced the head gaskets. Cooling seems OK now, not like before when it would boil over after idling for even a few minutes (gasket problems, I'm pretty sure).
I am about to fit a Milodon high volume aluminum water pump as well, and my question is: should I still leave the restrictor plate with the small hole in it, in the thermostat housing, or remove it? What does this thing do??

Thanks guys,
Chris