Are you looking for brand suggestions, or are you trying to buy a used one from someone on the forum? If you're inquiring about brand suggestions, you can check with Lakewood or JW - I'm sure they can help you. If you have a race car, I run a Browell. These companies will also custom build a bellhousing.
If you're looking for a used one...I have a JW for sale that needs to be re-cert'd - it's a universal GM (Chevy, BOP) - that I was going to use with a racing shorty PowerGlide, bit it will work with a LencoDrive or Bruno set up.
I've had Mike Stewart (Mike's Transmission) cut off the stock bellhousing to fit a JW. You can check with him to see if he thinks your case is worth doing - he may find that the crack runs further back. If you do cut the bellhousing off, I would recommend an aftermarket bellhousing, such as a JW or ATI.
After breaking an ear off my trans case (I had help from a friend) I added an Ultra-bell. Used my bandsaw for most of the cutting, then some grinding and filing to finish it--a Sawzall would work well, but I didn't own one at the time.
Ummm, I was referring to your question about what would case the bellhousing to crack...so, I was asking about what kind of mounts are you running. Solid mounts, if the engine and trans are not properly aligned, can lead to a cracked bellhousing. Also, a cracked bellhousing can be an indication of something failing in the chassis (cracked frame, loose subframe, etc.).