Dropping it back to 14 should help with the pinging but you may need to back up to 12.
Don't know a lot about the newer Holley's but that should be a pretty good carb.
There's tuning instructions on Holley's web site for making sure the carb is set properly.
Is the electric chock wired up, if not it can cause a rich condition.
There's a spring kit you can get for the MSD to help with the timing curve.
On the ones I was working with we were trying to get a quick curve for our app but with the 2 lightest springs the advance weights wouldn't settle down until rpm dropped below 1000, this was causing the timing to hang up while still advanced about 6 degrees interfering with the idle setting.
For you car one light spring and one medium spring should get you full advance around 2700-3000 and still settle down for a good idle.
Probably how I'll set mine whenever I get time to work on my 406 FE engine, been a while since I tuned 3 two barrel carbs but I think I remember how.
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