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Your booster is probably leaking around the seal where the brake pedal rod goes through. If you are not losing fluid, then it's more than likely the master cylinder itself. I'm not that familiar with the specifics for '63s. Just curious, does it have the dual plane front brakes with two wheel...

Are you losing brake fluid? or is the master cylinder full?

well yeah, now it sounds like you have multiple problems. The hissing is definitely a bad booster. The pedal going down easy should be a hydraulic issue - whether that's the master cylinder, rusted/leaking lines, or bad wheel cylinders is something you will have to investigate. If it's all...

That does not sound like a typical booster failure. Usually a booster goes bad, they pedal will be so hard you can't push it or it will still function but with hissing vacuum leaks. It sounds more like you are having master cylinder problems which would be easier and cheaper to fix. If you need...

BigBarney has it right! Lot of hard to find and pricey parts missing. Here's a pic showing how the bolt to the heads and connect to the exhaust manifolds as well as the exhaust pipes