Need help finding the right master/booster

[Dennis V]

I bought my 58 panel with a gm clip with disk brake and 9” rear with drums.
Braking is not good because of wrong master and no booster.
I found this on ebay:
- Universal Under Dash Pedal With 7" Dual Power Brake Booster Conversion Kit -
The Master Cylinder is for disc/drum and drum/drum application.
Universal Under Dash Pedal & Power Brake Conversion Kit Includes:

7" Dual Diaphragm Zinc Coated Power Booster (3-3/8" square Bolt Pattern)
1" Bore 9/16 & 1/2" Master Cylinder w/Ports on Each Side (Corvette Style Cast Iron)
Proportioning Valve Kit (Fixed Universal Disc/Drum Valve, Lines, Bracket & Hardware)
14" long Mounting Bracket
Pedal (Length, 13-1/8" from pivot point to pad hole) Pedal Pivot Point is Adjustable to 7", 8-1/2", 10" 11-1/2" and 13" From The Firewall.



Wil this work or do i need a bigger booster ?