I just went through this ordeal myself 408 stroker had the factory 2 core 22 inch radiator with a new short shaft clutch fan ,7 blade ,fan shroud, 180 F Stewart Warner thermostat very mild day I’m talking 16-18 degrees c while running anywhere from 183-190 F if I got caught in traffic or a railway crossing I would **** myself as temps would climb to 210-220F. Purchased champion 3 core helped a little but still low speed driving or stationary same issue. In the end I bit the bullet as I had too much invested in my engine and had a custom 3 core cross flow made running a quality 16 inch thermo fan running a 160 thermostat no shroud now I can drive on a 35 degree c day in traffic and it won’t go over 190F . It was expensive but it was worth the coin. I run the overflow behind the grill and cannot be seen looking front on as the bumper hides it and the trans cooler is mounted off the centre radiator support and just bent up some flat alloy strip to support the other side.
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