HH56 wrote:
Another option although it would involve a dual voltage setup or converting to 12v is to use an Electro-boost system sold by ABS power brake. That master is small and the reservoir, pump, and accumulator can be mounted separately. It is considerably more money than a vacuum booster but several have installed them in V8 models and so far as I have heard it seems to work well. I disagree with how some have kept the 1:1 ratio and instead turned up the boost to maximum to make up the difference of not having a higher ratio. IMO, that is an accident waiting to happen if something fails in the boost portion but apparently it has not been a concern -- yet.

I don't know if they still make the remote fill master shown in these photos but since that master is fairly slender it should be much easier to mount higher and closer to the column to get a better ratio. Even the regular fill models are about the size of a manual master and could get fairly close. If the remote fill is still around possibly it could even share the vent opening by modifying the vent tube to let air have a small channel and master can occupy a portion. Both functions would be present and if the master was partially hidden still look mostly stock.

Here is one install but I do not remember whose car it is.