630 Brakes

[Firefool]

Guys,

I have a 1956 GMC 630 has been sitting, to the point where master is froze. Truck has not been out of barn in 25 years. It has frame mounted master with Hydrovac, twin cyc drums. Any ideas should I try to save that system who knows conditon of the hrdrovac. Not sure if any of you guys have ever converted one of those systems to a newer style master/booster. Not really excited about the single outlet master. I know newer GM's have dual 1/4 in lines out of masters, what would that flow compared to old system, one would think that would push enough fluid these new calipers are getting big. Any ideas anyone has would be great, getting a plan together before I start buying parts.