Used Lakewood Part #15003LKW Scattershield
This has the provisions for the motor mounts used on 55-57 Chevy fullsize cars and 55-59 Corvettes. This can be used in most other Chevy engine applications.
This particular housing appears to be in nice unmodified condition, with good threads.
This is a limited stock item. Pictures and description are of the actual part.
Although this is a steel safety bellhousing it is old and uncertified, there is no warranty (except that, it is as described) of any kind on this part.