I've had good luck replacing a boom with an up-sized used boom from a Catalina 36. Presumably you would like to increase stiffness in the section (that or move the traveler into the cockpit). To increase stiffness increase the boom's top-to-bottom distance or height. Key detail is the gooseneck arrangement - ideally you want to match what is on the mast, or you want something new that will match the existing spar profile.

Who built the existing mast and boom?

LeFiell is/was a spar builder in Southern California, you might see if one of their off-the-shelf designs will fit Sweet Pea - hopefully they still build booms. Failing that, Buzz Ballenger in Watsonville can design and build a custom boom for you that will do everything you want.

- rob/beetle