There is a thread in this section about aftermarket cruise control. Take a look at that. One of the posters has several pics of a 67 GTO with hydroboost installed and he seems to really like it. Don't know what the rest of his braking system consists of. I have worked on many hydroboost systems. In general, they are used on trucks and heavy cars that require lots of boost or diesels that don't run a vacuum pump. Agree they provide little pedal feedback and provide tremendous boost pressures. When I worked on Ford cop cars with the system, we had numerous situations where we had to replace rotors because the cops would sit in the median after a little pursuit and kind of massage the brake pedal while they were waiting to jump out on the road again. The system put out so much pressure they would bend and sometimes crack the rotors from sitting still and putting heavy foot pressure on the pedal. On a 4-wheel drum brake system, I would think the self-energizing action of the shoes would make for a very touchy brake pedal combined with the super boost provided. Disc/drum would probably work better. Concerning Buick Grand National brakes: I am pretty sure all years came with the GM PowerMaster brake booster. That was a sort of self-contained electric hydroboost that used an electric pump and not power steering pump pressure. Sort of like an integral ABS system. They had all kinds of service problems and some GN's were converted to true hydroboost like the OP is asking about.
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