There are a number
of very good points in the comments below. The first thing to consider is whether the condition of the sailcloth is in good enough shape to warrant the expense of adding sail tape. If it is, and is of sufficient weight (I would guess 6 oz cloth as a minimum)then the next thing to consider is the expense of adding UV protection for the foot and leech. Sunbrella UV strips are expensive, as is a foam luff. I've found Sailcare, as noted below, to be a good place to have sail mods made, but also as noted they ain't cheap and they are really busy. I would think a local sailmaker/loft the best place to take the sail and to discuss what you want done in person with a qualified sailmaker. It may be that the price of all this suggests getting a new and/or used furling headsail. There are some bargains at many of the used sail brokers, if you know what you are looking for and are sure of the dimensions. A furling genoa, for example, will typically have a luff one to two feet shorter than a hank on sail to accomodate for the height of the furling drum.Finally, I've found that I can reef my 150 headsail with a foam luff to just about any size I want and still get decent crusing performance. I've had this sail reefed to about 60 per cent in a blow and the boat still did quite well. As the wind rises, sail shape seems to mean less and less as the boat is gonna go in a blow regardless of shape. Racing, however, would be a whole different calculation.