Just a thought:
Would this type of setup work if you can find the right retrofit part?
http://calponycars.com/1964-1973-classic/777-tra-658-538.html
You could call CJ Pony, their CS is pretty helpful and might be able to help.
C5ZZ-7507-A Clutch Equalizer Bar Pivot Bracket 6-Cyl/SB V8 65-70