looks like a GM bellhousing.
one thought was to do like youre saying and cut some of the adapter away to get to that thing. then id attempt to knock out that bolt in the slave cylinder, then use a shorter bolt, lock washer, and nut to clamp the top part of it down.
just some of my thoughts...
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88 Chevy Half Ton/ LB7 conversion
08 Chevy 3500HD, efi, 5” exhaust
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