I use the Tilton TOB too and would recommend it. It works very well and is standard on all the jbl's. The only trouble I had with it was caused by me and not the unit
Here is the pdf catalog page from Tilton
http://www.tiltonracing.com/pdf_files/PG-7-8.pdf
here is a picture of it. You need two parts...the black collar that attaches to the transmission and has a threaded neck. Different model transmissions require different collars. The TOB then threads onto this. By rotating the bearing unit, you can adjust the distance to the clutch plate fingers.
hope this info helps
Andy