There are heaps of car models with twin actuators on the distributors. One to advance with vacuum and one that retards with postive pressure. Porsche is one of the many cars.
But what do people expect to gain buy using it?
How do people expect to dial in the boost level at which the retard actuator reduces the degree of ignition advance?

Like I said it will be interesting to see how many of these turbo A series go. But I guess its all about ####ing up so you can learn from it. Its a shame that some will be lead in the wrong direction from the start.

My advice, leave the distributor stock, or use one of the many known elec distributors regraphed to suit a NA A series.
Dont worry about bullcrap ignition retard.
If there is detination, just back of the dissy to reduce the degree of advance. Then sort out why it was detinating. 99% of the time it will be lean fuel mixture.