MSD distributor tuning

I forgot to mention as well.
Anything over 15* initial the thing will ping when hot when giving it a slight push on the throttle. I'm using autolite 64 plugs. It helps reduce the detonation.
I recently changed from a 1406 Edelbrock to a 650 Holley spreadbore. Just by doing that I was able to go from 10* to the 15* before the thing started pinging.
At this point, I think I'm maxed out on my initial timing and need to get the total closer to 36* before adding the vacuum advance.
Thanks!