What bellhousing for a 4 speed in a slant 6 Duster

I have a 71 Duster with a slant and was planning a V 8 4 speed conversion. Now I find myself wondering about a 4 speed behind the slant. Is there a bell housing for a regular 833? I see a lot of slant bellhousings for the OD tranny, but I understand the hole for the bearing retainer is larger. Thanks.