Timing /6 without advance port of the carb working correctly??

I see another adjustment bolt like you said on the bottom, but to get to it,.I would need to remove the oil filter.

Man I've been out of the loop for a long time and haven't owned a /6 since the early 80 or less. I've always had big block cars and very few /6's.

With the dizzy having this extra adjustment bolt on the bottom,.do I need to loosen the normal adjustment bolt and the one on the bottom to get more timing? Or do I just loosen the bottom bolt and adjust? Doesn't seem I can get to that bottom bolt without removing the oil filter. So this won't be possible to set the timing using that bottom bolt.