What are the measurements that you got for 0, 90, 180, 270 degress? I'm just going through this now with a similar setup.
David Kee is a great resource. Make sure that it is clean on the bellhousing. I took a file to it just to make sure that there were not any paint globs or other such issues. Also, make sure that it is flush and tight all the way around. Get the measurements and then divide the difference by two and you have your values. Luckily mine was not too far off -- going to need the .014 offset dowel. Now if I can just get the dowels out, I'm good to go...
Scott