Oh what a day...

Not mine, but one way to do it. May be the one map63vette saw. It's super easy. There are also places that make generic plates for hydraulic master conversions, Wilwood makes brackets for its master cylinders Wilwood Master Cylinder Adapter Brackets 250-3677

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Yep, that looks like the one. I had originally thought about doing one of the American Powertrain setups or whatever it is that mounts the master where the factory clutch linkage used to come through, but didn't think their little bracket was worth the $300+ or whatever they wanted for it. A simple steel plate and some welds was much more up my financial alley.