Base Timing Questions

Ok I was able to play in the garage for a little bit. My engine indeed wanted more base timing. A lot more. Like 42° which tipped me up just past 50 all in at 3000 rpm. My vacuum made 15hg.

I know thats too high…..
It takes some cranking to start up however so I started to back off 10° which helped.

One thing I noticed was that trying to adjust my A/F on the 4150 the vacuum never really changed until the darn screws were almost all the way in. Currently they are set to a default of 1.5 turns out. What am I doing wrong?
Sounds like you might benefit from manifold vacuum on the advance can.