Long Shot!! We are looking for a two piece rear seal for a small block Ford that is a new old stock. Some in gasket sets used to have the Ford part number on them. The new replacements from Felpro seem to stand off out of the seal groove an excessive amount. The rear seal did not leak on the dyno but did shortly after install in the vehicle. Worst case we will remove, dis-assemble, and machine for a one piece. A lot of work! Perhaps you have a dusty old JV730R or a BS30136.
Jim #94