power or manual brakes

Hi I'm new to A-bodies so be patient if I have some silly or redundant questions. All you guys have lots more knowledge than I do so here we go: I would like to get some opinions on running manual or power brakes on my early A-body. Right now my car has power brakes with K-H four piston discs up front.I have had some guys tell me I don't need them for this size of car and besides the booster kind of takes over the cars engine bay and sits only about half/inch off of the valve cover.On the other hand a co-worker (who was a chrysler tech in the 70's at a dealership)told me you should run power brakes with discs always. I'm leaning towards ditching the power booster, if I do can I just bolt this master cylinder to my firewall? The bolt pattern looks the same.Could someone tell me if they know what booster and master this is on my car?Does this master look like it can be run as a manual system?thanks for your help and opinions.(I sure hope my picture uploads ok otherwise my last questions were silly ones!!!)

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