Hi Peter,
My radiator configuration at present is OE S2FL, with the fan behind the rad in a pull configuration. I'll be using DCOE45s and am hoping that I can find room to fit a plenum chamber over/round the carb bellmouths, but I know it will be very, very tight space wise. So whatever I can do to increase space between radiator and carbs will be done. I'm certainly looking at a custom radiator and even trying to move the radiator forwards, if indeed that is possible, to try and squeeze a plenum chamber in. Until the refurbished engine and carbs are in the car I won't know just how much (or more accurately, how little) space I will have to work with.
Eric has already warned me that it's borderline whether it's possible or not...
Graham