....
Your b series has a 10 timing set so I wonder what the spec is for a 3b?
Here what a 1988 FSM says about the various timings (late-model B and 3B along with 11B and 14B:

It lists the late model B and 3B as being set exactly the same! (The 2B isn't covered in this manual.)
But I'm getting way out of my depth here.
PS. I think the addition of the word "At" in the image is a typo. (Or they perhaps meant to say "At 0 degrees BTDC")
PPS. Just noticed the Orange sticker has a typo! It says BTC instead of BTDC!!!!






it's quiet in that corner.