Pulley Diameters

+I will throw in here. I drove my 505" fish yesterday , 96* w/ humidity. The hottest I have driven the car so far. Running a 17", 7 blade alum. fan that has a steel center( factory). A new flow cooler water pump, w/ a new jaguar 2765 clutch.. It ran at 195 for a while, then 198, the 202, held for a while, then in town went to 210 and held steady, got out on the 4 lane coming home started showing of a little, "really wanting to see how hot it would get w/ the new set up." It went to 216 and stayed there till I got home, and went to 220 after shut down. Not too worried about it now, but I think the shroud is too thick, as the clutch puts the fan almost inside the shroud, w/ only about 1/2" sticking out the engine side. I think the 10,000 rpm flex fan , belt driven would fit the shroud better and make it run a cooler (I think) , but I `ve been switching stuff around , experimenting so much, I`m tired of fooling w/ the dam pump bolts. The jaguar clutch to pump bolts were a *****, ended up using studs, getting all the nuts w/ lockwashers started before tightening any down, even had to file a spot on the clutch hub in one spot for a little more clearance to start the nuts! Anyone kick in here w/ thoughts ???

I might try a smaller diameter fan pulley if I can find one that will work w/ my steel crank pulley.