I just looked at ur pic, shroud and fan are worthless. The fan is sucking air from the sides of the shroud backwards from the engine compartment , fan don`t flow enough anyway !
I drove my 505" fastback a little yesterday , it got up to 208 in town , and cooled back off to 195 on the road , it was 96 in the shade and pretty humid .
How much room do u have between the pump and rad. ?