Any pinched end IOR-influenced design is going to be touchy downwind, and the
rudder on a Mk. I is a little antiquated. I own a 1973 Viking 33, also a
C&C design, and the two boats and the
C&C 34 are really quite similar.
The problem is not the
rigging, but the whole way it ties together with that old, often frozen balsa
core deck. You have to
bed and inspect and rebed and rebolt the chain plates, and probably have to recore the
deck and install
backing plates to beef up or refresh the original arrangements. Obviously, if the rigging is 35 years old and from freshwater, it goes into the "spares" category, along with all tangs and pins, etc.
But the fixed
portlights are weak, and the hatches are sub-par for
offshore. I won't even touch the likely Atomic 4
engine and the ten-gallon gas tank and the unlooped ventlines and the 1970s Romex 10 gauge house
wiring on the AC side.
You already likely know about that.
Don't get me wrong: the
C&C 30 is a great inshore, lake and coastal boat. They still win club-level races. But they are not in my view adequate or safe for
offshore. Not with 1/4 inch plexi in weak frames and tired rubber in the Atkins and Hoyle forehatch and smoked
Lexan dropboards and Barlow winches.
You want to stay within sight of land with all that in a 35 year old 30 footer. You could beef it up to make it safe, but you could also buy a more appropriate boat for offshore.