another 360/408 over heating

Get a playing card and when the car is idling with fans on, see if it gets stuck to the radiator, if not you do not have enough pull of air through the radiator, Buy the biggest flex fan you can fit probably a 22inch put those electric fans on the other side of the radiator. now you will have the problem of running too cool. I have seen people run 440s with and 2 row slant six radiator, the secret was the huge flex fan constantly pulling air through the small radiator. Looking at the pictures those fans are too far away no pull of air.