Short of swapping Garth's coolant transfer hardlines, heater hoses over to the the '85 GT, I am trying to figure out a way to tie the system in. 87-88 run a different system as we all know. Looks like there plug beside the thermostat housing and one on the outside (battery side) of the water pump housing I am looking at. From the coolant diagrams, I am pretty sure the coolant flow would be correct. What have others done when swapping a 3.4TDC into the 85-86 V6 chassis?