Agree that original rigging on many boats that age is the norm rather than not.
If you're using Ocean Rigging, and he says things are OK then I think you can relax and enjoy the boat for now.. As the others have said, though, to be absolutely SURE you're good, a replacement is in the cards.. just in case.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)