Here's the TSB info on that showing the gusset, it's over at hamtramck-historical. The links will show the full size version. This shows the issue on the opposite side from what is usually needing clearance for the narrow "V" shaped uca's, but it would work for both sides and you can imagine that cutting the mount back too severely could cause cracking at the other side.
https://www.hamtramck-historical.com/images/TSBs/1973/02-08A-73C page1.jpg
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https://www.hamtramck-historical.com/images/TSBs/1973/02-08A-73C page2.jpg
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