After talking to a very good source with the questions i have, i am convinced i have a rebuilt Master Cylinder core that was installed by the original owner. Original MC is long gone.

As stated prior. 204th day of 1973. Definitely not your original.

I have to agree. I had someone looking into this a very good source but never heard back. But you are the second person to say a 1973 stamped date code and again fully agree what you are saying. Its a rebuilt MC that has no bleeders. But the Master Cylinder part number had a 351 Cast date on it. Which can make it a late 71 cast date? Which probably would match my Nova. Just a guess. Thanks for your input.