Project Requiring NAD27/NGVD29

We have recently acquired a project that is part of an existing structure that was built back in the 40’s. This project is requiring us to use the original datum that was used when it was built. Without going into too much detail the project requires us to use of NAD27 and the NGVD29 vertical datum.
I have noticed that TBC lists NAD27 as a recognized coordinate system but I’m having a difficult time figuring out where the vertical datum is or if it is even available. Thought I’d just get the question out there and and see if you might have any thoughts.

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