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Shannon,
If your MC plunger is rusted you don't have much choice. Your decision is not whether you to replace/rebuild the MC but 23 vs 19 vs 17mm. Which one is not that critical. Even the experience of DD supports that. If you will feel better talking to your peers that, "Yeah, I went to 19mm MC", or you like the physics presented by Harry Hoover and wish to go with 17mm MC. As Dave said, you can't compare side to side. Neither functioning MC and system will result in pedal to the floor and both will provide a firm system.
The best mechanic long term for you will be yourself. Having any 30 year old car, part of the enjoyment in having one is the puttering arround with making something better. If you find or have found that the repair aspects do not provide enjoyment, exchange the 914 for a recent model and enjoy the driving.
L. McChesney
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