I believe that the hydrovacs have a bleeder screw, but honestly I have never messed with one, only to remove them and install hydroboosters.

I would guess that yes you should bleed it.
I'll have to refer you to the shop manual for the details.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-