There are a variety of things to do to optimize your 331 to its rating, but you should first have a good idea of how the area handicapper deals with modifications. PHRH_NE has a pretty thorough writeup (http://www.phrfne.org/page/568
) as to NE area adjustments. A 6 second penalty for a folding prop is a no-brainer. However, trying to make a 331 model into a race boat by changing it piece-by-pieice is a losing proposition. If you what a race boat, sell the 331 and buy an performance boat like a First series or an older C&C or J or whatever. The 331 is a curising boat, you can dress it up, but it'll never be particularily good at getting out of its own way...and will race to its rating, only if optimized and on a good day.
Add a 155 genoa? Whoever buys the boat next probably won't want it, takes too much crew...
If you go in a direction such as an oversize main, the handicapper should give you a "no-brainer you lose" penalty as discouragement, because PRHF is intended to discourage expensive one-off modifications - they ruin the game for everyone else.