For a 496"B around 550 HP here's my setup. Stock style 26" aluminum radiator from Mancini with matching shroud, 5 blade MP fan with thermostatic fan clutch, MP high volume water pump, Mr Gasket 180 deg "high flow" thermostat. If anything, it overcools. The Mr Gasket thermostat must crack open a little early. Except on a hot day it runs 170-180 most of the time. On a hot day it will run 180-190 at idle and cool off running. I'm well pleased with cooling system performance and can use stock hoses from NAPA for a 26" radiator.

When I ran without shroud it was hotter at idle on a hot day. The shroud helped.