[Jmclendon]

Perhaps that's the difference? Mine is a 61. From some of the other reading I've done, it sounds like the 60-61 years were quite similar..... and that changes started to come about after that?

I don't know the answer to your question about whether or not the vacuum is an 'always on' kind of thing. However, I'll definitely check..... The manual for my year definitely doesn't say anything about the vacuum advance though, and it states 5 degrees.

As always, I'm left with more questions and curiosity LOL