Are you running fuel injection or carb?
For carb I ran the MSD 6AL-2 programmable for a while and it can pull up to 25 degrees. It’s a nice box and has many other features such as start retard, step retard, etc. all setup on a PC using the MSD software.
For fuel injection, I would go with a quality ECU that can do what you need such as Holley or Megasquirt.
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