I'm 'll be in a similar situation using a Hydrobooster and not having power steering gear box.
My plan is to use the lowest flow Saginaw "Type II" or model "TC" pump and ensure it is the correct pressure for the hydrobooster. http://www.summitracing.com/search/...g-pump-model/gm-type-2-saginaw-tc-series
More info
http://www.tuffstuffperformance.com/PDF/TypeII_PSP.PDF

Trouble is they made so very many versions of those pumps and I have yet to figure out which one is best suited, some are even reverse rotation which might be handy depending on how I mount it.

With the pump I'll use a large remote reservoir. The hydroboosters use "a spoon full" of fluid with each application, otherwise all the fluid that goes in is returned in this case straight to the reservoir. They don't need a lot of flow if you won't be using a PS gear box as well.

I would not use an electric pump because of the cost, complexity, and potential troubles in comparison to a simple, cheap, and proven PS pump system.

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-