Congrats on the boat, nice.
Answer: It all depends on how the plumbing is installed. Anyone who gives and answer simply doesn't know, or assumes it's stock without knowing what any PO might have done. There are four or so ways to do it.
I suggest you trace it out and find out what valves and connections you have, describe those and ask again. You could start out with the manual, those from your vintage boat were quite good (mine is
).
Then we can help.