I failed my smog check on my 1.8L 1995 Toyota Corolla due to ignition timing so what is the correct ignition timing for my car and how do I fix it?

What is your ignition timing? I ran into the same problem. My 95 Corolla failed the first time when I took it for the test. Every thing was very good except the ignition timing. I took it back to my tune up mechanic and asked him why because I did a major tune up before going for the smog. My experienced mechanic looked at my car and told me that for the particular model that I have (made in Canada as opposed to the ones made in USA and/or Japan), the ignition timing can not be adjusted. He showed me the data from his computer and yes, for those that should be adjusted, it should be 10. But those have a different shape. The data the smog mechanics (who provided the data?) are getting do not take into account the differences betw diff models. He told me to should the smog tech under the car hood there is a sticker which indicates what should be adjusted and ignition timing is not there, and "No Other Adjustments Needed" is there. He told me some newer cars don't allow ignition timing adj so people won't make the wrong adj.

He told me to look at the smog inpection data when I bought it 2 yrs ago, and under the ignition timing it was N/A. So I went back to the smog tech and showed him. He believed me and my Corolla passed it. I wish whoever provided those smog data specs to the smog techs could update them. It was an unnessary trip to my tune up mechanic and back to the smog mechanic and the pollution created and what was the purpose of the smog inspection?