Charlie,
I'm running a 351C with a Rover SD1 radiator from brass.
There are 2 Kenlow 13" electric fans suction type installed.
Original FE surge tank is added to increase the total volume of coolant.
Temperature is allways normal even under bad conditions.
Important is not to install a suction fan directly to the radiator mesh.
Together with the fans, Kenlow delivered two metal rings 13" dia and about 40mm high. They act as simple shrouds setting the fans away from the radiator creating some air volume which makes the fans very efficiant.
The rings are covered with edge piping to the mesh side to avoid damages.
If this helps You don't have to build complex shrouds.
Thermostat is a 160.
The best thing is a electronically fully adjustable fan control switch from Revotec which is build arround a aluminium tube. The temperature is adjustable by a potentiometer. The inside of the tube is completely round, nothing to disturb the water flow.
It comes together with the loom, relais and instructions. see
www.holden.co.uk and on the e-cataloque go to cooling, fan accessories.
Good luck,
Uwe