your turbo is a bit on the small side to run WOT and stay cool. Water meth will help. going to bigger Injectors will get you hotter the 370HP are about 90HP over stock if I recall correctly. If you got marine 370 they are the wrong spray pattern and will run hotter and less efficient when compared to a 370 edm'd for dodge pistons.
a 3pc exhaust manifold will bring temps down about 50 degrees. you may also have too aggressive fueling curve on the fuel plate. has your timing been adjusted?
btw you have 1 too many zero's in your EGT #
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