Well, I have moved forward a little on this mystery.
Firstly, it appears that the vacuum supply for the brake booster comes from a fitting on the carburettor (thanks Owen-Dyneto). At least in theory, because the car now has a 4-barrel Edelbrock carby, which I imagine has a similar fitting. Further investigation needed. And perhaps a call to the previous owner, who fitted the carby.
Secondly, I can just spot the top of the master cylinder in front of the bulkhead (not enough room to crawl underneath). Sure looks like the top of a Treadlevac unit. See pic. Further investigation also needed.
Will get it up on a hoist to investigate properly.
Cheers
Brian
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