I've got a new-looking 40 bellhousing, but I don't know what it's from. I'll try to remember to get the part number to you so you can check it out.You can mate your 3 speed case to an H42. Cruiser Outfitters sells the parts.
I’ve got a good H42 here with a 4 speed case that needs to be rebuilt I’ll sell cheap. I would go through both of them and put fresh stuff in. It’s a MUCH easier swap than H55
You will also need a 2F bellhousing.
EDIT: Figures. My search turns up a 58-74 3-speed bellhousing. Likely the one you already have.
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