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The engine doesn't have studs, it has head bolts. Rule of thumb on bigger diesels, EGT thermocouple pre turbo versus post turbo, 300 degree difference. I'd play it safe on a DT466, put a pipe plug in the hole you drilled, re-drill pre turbo for accurate EGT reading. Plenty of room and easy to do. You probably have a Bosch injection pump if I recall correctly, the fleet of DT466s our shop maintained during that era had Bosch pumps. Stands to reason, an overly large aftercooler will drop boost a bit.
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