I don't remeber off hand how the stock 715 linkage is. I remember that it has a pivot on the block and a pivot on the frame, but other than that I'm a blank.
What I did was to get the linkage off my donor K truck. I had the pedal from the 715, as well as the rod that connects the pedal to the roller (?) part. That was it. The GM roller part (?) was all I needed. I took some flat 2" by 3/8" bar plate (from Home Depot) and bent it into a "I______I" shape and then put the roller (again?) between the posts of the "I______I". I welded the bracket to the frame, and used the stock bolts from the roller to bolt it to my bracket. I moved it over as far to the driver's side as I could as to give me plenty of room between it and the block.
Here is a crappy pic-
(This is looking down from the master cylinder)
Then I used a stick of all tread to go between the roller and the throwout fork. Pretty simple, and really sturdy. The tricky part is that the bracket you make has to have a mount for the pivot on the front of the passenger side of the roller, and a mount from the bottom to the pivot on the driver's side. This is due to the arms of the roller being located. You'll see what I'm talking about if you look at your roller.
Good luck,
-B.
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