Here is a listing for a Buick cable operated bellhousing for $75. Since they don't show up all that often I considered it a good idea to post it and pass the info along. Mike Moor demonstrated how to use this with a standard 3/4" bore push slave cylinder and S10 clutch arm.
BOP pattern fits Buick V6 3.8, some 3800?, V8 300, 340, 350, and Buick big block engines among others.
http://www.ebay.com/itm/142487665673?ul_noapp=true
Jim