i recently blew the clutch in my 69 chevelle and some pieces went though the 621 housing i have obtained a 3815891 housing does anyone know if this would work till i can get a new 621, they seem to match up well but i thought i better get a second opinion.:beers:

Junior... I think your 891 is for the smaller 13 flywheel / 10.5" clutch. Do a search on 3815891. Tom Parsons of DZAuto goes into BH detail...
http://www.chevelles.com/forums/showthread.php?t=142525&highlight=3815891