Thanks for sharing the link, that’s in interesting arrangement. Here are a couple of other alternatives for adding a power booster to a 60-62 while keeping the hydraulic clutch:

http://www.sixty7ss.proboards.com/index.cgi?board=engine&action=display&thread=666

And an even cleaner design along the same lines, but mounting the master on the other side of the steering column:

http://www.67-72chevytrucks.com/vboard/showthread.php?t=362375

1960 GMC 1/2-Ton Pickup Truck
In the Gallery
Updates in the DITY Gallery
Now cruising in the Passing Lane