Boost timing

I am putting together a Novi 1500 , 440, 6 to 8 psi boost
Quesstion
I have an MSD 6AL ignition and I thought MSD offered a simple boost ref add on timing retard but I cannot find it.
For my initial Drive/ tuning can I retard the timing to say 22 degrees until I update the MSD to a unit with a boost ref retard?