the exploded view of a 302 in my haynes manual just calls it a rear cover plate. in the text itself they just call it the engine plate.
Its called "the large metal plate that bolts beween my engine and my tansmission" Dont ya just hate smart asses?
Are you talking about the bellhousing separator plate? https://www.cjponyparts.com/bellhou...IsCS7fZ_zhWUKiEokMqDw_i1lVZMGqpcaAkdvEALw_wcB