if the antifreese is comming out of the exhaust, my guess is that you may have a crack head. or unless you route a coolant line to the intake thinking that it was a vacuum line.
you know it might just be burning whatever coolant that was left there from before. have you check you coolant, did you loose any. if you did a good job of cleaning and torqued it the rite way. and if you head was checked good than my guess is that it's just burning off the coolant that was already there from before. but if it is still doing it after a while you may need to check your head again. they may have over looked it and missed the crack.
you'll never know..