If it has a davco with coolant heater check that. or you have bad injector cups those are the most common.
The heads are idenical except the egr heads have casting for egr cooler bracket.
make sure you match right gasket to head or you will have coolant in your oil.
Egr engines you can gain fuel milage by using a frost plug to block off exhaust gases from entering the hot pipe. pull the hot pipe off and...