I would be worried about how close the exhaust side of the turbos are to the radiator tank. I would think a glowing red turbo that close to the tank would cook that coolant. Not trying to be negative but it is easier to address now versus later. Maybe someone that has done this before can chime in.
there is 2 inches of room i plan on getting the housings jet-hot coated and runnig heat sheilds over that. and if i still run into a problem ill just run one of those blankets under the heat sheild