I don't have experience at this level, but I might be able to take some readings from mine so you can compare. Do you have a late monovalve system or an early servo system?
I think the '80 is the servo system. If so comparing to mine won't do any good. I have a bulletin at home that may be helpful. If you will email me privately with a fax number, I can fax this information to you.
BTW, you have replaced the tubing behind the glove box, right?