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The hot tip is to bolt the trans to an iron bellhousing while welding. The aluminum weld won't stick to the cast iron.
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A local guy did this for me on a T-10 I bought in Minnesota. The case was perfect when it left Minn. , ...... but UPS decided to save some weight on the shipping and broke the upper left tab & web off.

One of our local racers is a professional aluminum fabricator. He created another tab, welded it on, did some die grinder work and finally hit it with a sandblaster and you can't tell it was ever damaged.
Anyone in our area need any aluminum repair done, see Rick Arnett!