Been lurking on the forum for awhile and thankfully haven't had any major problems with the car. But I have an 87 TA with the 305 tpi, coming into work I had some coolant hitting the header and smoking up it appears to be coming from where this line goes into the motor. What exactly is this line. Hopefully you can tell from these pictures.

 

If better pictures are needed I can try to get them when I get home in a few hours. Just a tight space to work in

 

Found the culprit in the day light. Pin hole in a heater hose, im guessing thats what the hose is anyways.