Turbo six on a Budget

Quote” …and run a straight distributor With a turbo Volvo distributor vacuum advance with retard. Yes it goes both ways.....vacuum advance and boost retard in one unit.Quote”
What models would this vacuum advance have been available on? This is interesting idea.

Vacuum Advance / Boost Retard unit
this is a great thread on this topic. pretty sure the stock dist works up to about 9 psi nicely though.