you can get an adaptor plate to suit the bellhousing ...theres a guy by the name of Aza510 on twincam.org who was making these a while ago...there was another business also but i cant remeber its name
alternatively you can buy a custom bellhousing from either dellows or bill sherwood.
im running a w57 from an ra60 with one of bill's bellhousings and have had no dramas