I may be wrong but I don't think standard Mopar aluminum 833 OD or GM cases had these gussets.............
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FWIW, The MP Chassis book implies all bell housings are the same length at 7.380". Realize adding a .125" block saver plate relocates the stock pivot point rearward as well.
This input appears to have been shortened already. I wouldn't be too anxious to chop any more off of it. Once you have the bell setup you're going to use you'll have a better idea of what mod may be necessary...
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Some good info on the 833 here...................
[URL]https://www.passonperformance....833-transmissions-—-how-to-rebuild-and-modify[/URL]