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I have a 330 out of a 67 Cutlass, a 350 from an unknown source, and a TH400 OC-68 with a 10” tail. For sale in Quakertown, PA. They all need rebuild. $100 for each engine, $50 for the trans.
You'll notice that it isn't machined and the hole for the retainer bolt isn't drilled and tapped.
Not the end of the world, I had one of those rebuilt years ago for an A body and the shop was able to machine the hole for the speedo. It only added a nominal amount as the whole case was disassembled for the build.
That said, I have a similar 68 TH400 out of a full size also listed on this site that I don't need and can't get $100 bucks for it, so YMMV