Once again I have to pull off the 86, someone has to get a 85 manual to CaptKoas so he can upload it to the tech section, this is the 5th time in 3 days I have referred to the 86. Oh well I degrees.
Here is the
link for the 86 manual. First thing I would do is go to section 6E8-11 (page 889), this is the beginning of the pic diagrams for the 305 engines, you have to pick which vin code your truck is. (see pics) and then compare to what you said you have on your truck to make sure they did not change something between 85 and 86.
The section on emissions start at section 6E-1 (page 860), component system starts at section 6E-7 (page 866) which tells you what each item is and what id does.
Until you get somebody to give you pics of their 85, at lest you can read up and familiarize yourself with the components.