[Fot] Ignition timing and compression

[Scott Janzen]

The GT6 recently got a nice valve job, and in the process we verified that the
compression, which I had thought was 11.5:1, was actually only 10.4:1.  Now,
approx. 40/1000 later, it's 11.9:1.
So, the question is, how much should I dial back total ignition advance from
the 32 degrees I was running?
Also, expectations with Weber carb set up - will different jetting be
required?