What tranny is this?

that is an A-body trans, the O/D trans uses a different bellhousing,
http://www.darkside.ca/a-4spd.asp
http://www.slantsix.org/articles/4-speeds/ODA833fourspeed1.htm
http://www.brewersperformance.com/
http://www.passonperformance.com/
floor hump also here
http://www.autobodyspecialt.com/