Pre-62 A, B, Hemi and poly motors all had extended flange cranks and aluminum bellhousings. This doesn't include the early Chrysler Hemis that had the upper bellhousing that was actually part of the block casting. (Edit - some if not all fluid drive semi-automatic trannies had cast iron bellhousings; AFAIK, all pre-62 Torqueflite and Powerflite trannies had aluminum bellhousings)
