Originally Posted by Sanduskysailor
Stay with the 1/4". The heavier wire might cause you issues with matching up your turnbuckles and headstay pin sizes. 1/4" is slightly oversized for that boat anyway. 7/32" is used on a lot of 29 footers. The heavier wire will also be more weight aloft which will make the boat heel slightly more.
I agree. While it is true that the 5/16 wire will feel more sturdy in your hands and will be more stout, I doubt that you need the extra strength for this 1974 boat. You didn't mention whether the standing rigging was worn or wearing out. it not, I don't think you need to replace it just to upsize to a larger wire.