Might be best to start with the installation PDF.
http://www.advanceadapters.com/downloads/712550.pdf
It covers everything needed and using a Ford application throwout bearing allowing the Chevy clutch fork to work properly.
As I've posted elsewhere I was first looking at this for a 72 C/30 I had in the late 90's. Basically its a clean swap with the right parts. It bolts up to the bell housing and I was advised at the time unsupported was fine using the existing rear engine mounts on the bell housing. Might want to call them (AA) if you can't find it the provided links.