833 od 4 speed

You don't need another bellhousing. Take the bearing retainer off and have it turned down to the size hole in the bell you have. If it is the medium size hole, you will be OK. The OD is the large size retainer. go to www.slantsix.org they have a good tech artical. just my 2 cents- if you turn down the ratainer, when you blow up the trans, you can swap a close ratio right in.