Dual diaphragm brake booster

[BigBlue]

Hi all, has anyone installed a Dual diaphragm brake booster in a 68 B-Body?
I have low vacuum and can’t get My SSBC 4 wheel disc Brakes to wow the car down.
I will be installing a vacuum pump, However I read up that a Goat owner had the same issue with the same setup and one of his fixes was a duel diaphragm booster.
Any ideas would be appreciated!!

 

[beezee]

A friend of mine installed a hydro-boost on a 74 Charger with Wilwood discs,now brakes with little effort.
http://www.hemi6t8.com/hydraboost.htm