I converted my 72 with SM465 to Hydro clutch.
I used an 86 GM master w/ 80s Toyota LandCruzer Slave.
I bought a slave mount bracket from Advance Adapter, they make the bracket for the LandCruzer guys that put Chevy drivetrains into their LandCruzers.
The Slave:

Master: I mounted it upside down, I used an angel finder to mount the master level with the throw of the push rod, you need to make sure that rod gets pushed in nice and strait and release all the way too. I mounted a 1/2 spacer inbetween the master & firewall to bring the master out for full release of the push rod.

You can see the bolt sitting in the hole were I mounted the push rod to the clutch peddel, the hole in the firewall is a bit messy as I had to reaise my mounting point from my original hole drilling...
Been running in there for a few years now and works great!
Oh, bleeding the system was a huge PIA, I had to bleed in sections to get all the air out.
Good Luck!
Burt