What size engine and is it a three speed? I had a major issue with my disc on my 261. The new disc I bought from a repop seller was actually marked incorrectly as the flywheel side. After pulling the tranny twice, I found the right one at NAPA and it went in without a hiccup. You can usually find a pilot tool to center your disc from one of the local FLAPS guys. I used an input shaft from one of my old trannys. Some information on the incorreect disc issue on my webshots albums.
http://community.webshots.com/user/geezer
