Look for info starting on this website about the McLaren M80 and M81 Mustangs.
They were limited edition carb turbo 2.3L Mustangs that were limited edition performance tuner cars similar to the Mustang SVO or Saleen Mustangs.
The M80 and M81 Mustangs had the boost raised to 11 lbs boost, a high flow exhaust, BBK wheels, Firestone HPR radials, Hipo springs and struts and shocks, and special body panels and paint job.
They were rated at 175hp, same as a 84 1/2 Mustang SVO and are extremely rare. Performance was handling were rated very good and it was stated that this is how the carb turbo Mustangs should have come this way from the factory.
On the vacuum cannister that controls the wastegate IIRC their is a set screw inside the port where the hose hooks up that can be turned to adjust the boost.
BUT HEED THE WARNING: If you turn the setscrew out too far it will pop out and you cant get it back in and then you are royally screwed. Only way to fix it would be to take apart the vacuum cannister and I dont know of anyone who has successfuly done that.
I have also heard of people changing the length of the boost vacuum cannister control arm.
You would be better off buying a Gillis bleed valve .
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