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Here'sa screen shot off my phone of Zip Corvette's site.
Bottom line is, it's a Corvette everything is available. Good used stuff out there as well as a number of vendors selling new parts. Putting in a manual has been done many times. Also consider your rear diff gear ratio. You may find your auto rear ratio to be a bit to tall.
I made this swap on my 76, bought a complete kit from Corvette Central. Seems to be high quality and very complete, I had to weld a bracket for the cross shaft to the frame. The body was off when I did that, might be more difficult in a whole car. I think the cost was a little under $500, this was for pedals and linkage. Good luck.
Peter