Sold! Thanks for the interest.
I've got a brand new 2B075C combination proportioning valve/distribution block that I recently bought from CJ Pony Parts to see what the internal parts looked like. Now that my research is complete I don't need the valve, so I'd like to try to recover some of my costs. Normal retail price is $89.95. I'm asking for $50 plus shipping. Here are the details on CJ's web site:
1. The mounting bracket on the one I have is attached differently that the one shown on the web site. See the attached picture.
2. The web site advertises it for "1968-1970". 1968 and 1969 Mustangs didn't use a combination valve like this, and it won't fit a '70 because of the mounting bracket. This valve is probably best for someone doing a drum to disc brake conversion who doesn't care about concours correctness.