I have been reading about the differences between the 85 and 86 T1 engines. I am aware of the different heads and piston as well as the LM and Dist. However, how can you tell the difference in distributors? Is there a part number on it ? I know that the two different distributers have different spark advances. The only thing that I have read is that the distributors caps are a little bit smaller on the 85. Is this true? Thanks.