Of course it can never be that easy.
The new 4 speed has a 4.8 inch bearing retainer and the BB bell I have has a 4.3" bearing retainer hole ...>DOH!!!!
Soooo the option and first reaction was to get a smaller bearing retainer and see if it fits on the trans. Then wait a min.!!!!! the bell with the smaller bearing retainer opening is for a 10.5 inch clutch. The bell that is correct for a 68 BB is actually #2892262 and it has a ****gasp*** 4.8" hole that corresponds with the trans.
So the options are to turn a bearing retainer down or bore a bell out (don't really care for either)
OR
get the correct bell and upgrade to a correct 11 inch clutch. (oh, crap more money as those are not cheap)
after thinking about it and thinking about ...and then some more....I am still not sure.
I think I am going to take the bearing retainer off and bolt it to the bell I have and put it in the car for mock up while I cut out the floor for the four speed hump.