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Hey Jeff, Don't re-plumb.....there is an o-ring under that rectangled block it should hold a full tank back pressure unless something is broken.  Let me look in the morning I may have one that will work or at least give you an idea what size you need.  I will also send you a picture of a tool I made to get that gate valve apart.....with an empty tank of course.

Thanks Steve. I actually have replumbed it already and it’s a brand new valve. I did drain the tank and pulled the paddle assembly out to verify the o-ring was in place. I put some more plumbers grease on it and put it back in. I will test it again, maybe it just was not fully seated. Good to know it should not leak. I was a bit frustrated after all that work to replace it and it was still leaking.