I use a 6:1 setup utilizing the Harken 2.25 triple ratchet and a 29mm carbo triple on top. Line choice is 5/16" Yale Lite 50' continuous. Pics can be seen at tampabaycatsailors.com in the pictures section. The Blaster uses 1/4" line and is 1:1 with 2.25 jib blocks.
A 24' mast should support a 125-135sqft mainsail. However, the only drawback with a large sail like that will be the leeward hull immersion. The H14 is not known for its' bouyancy! Hope this helps.

Bob

"The election is over, the talking is done, Your party lost, my party won. So let us be friends, let arguments pass, I’ll hug my elephant, you kiss you’re a $$.”
Liberalism = A brain eating amoeba & a failed political ideology of the 20th century!