Length isn't a problem. Adjusting the head weight and grip weight to adjust the swing weight is the problem. Most pros are at 44-44.5 but they have tour vans to adjust swing weight. A weight set for a 913 head will not be easy to find. A good local shop can butt cut your current shaft and regrip. They can also help you adjust the swing weight.

RP, Titleist stocks to a standard length. You can custom order any shaft from your local Titleist distributor and any length you desire or, since its an older version club, go to a golf repair shop and have it shortened to meet your specifications.

If you shorten the shaft by 1/2 in. to 44.50. Which is the driver length I use. For each 1/2 inch shorter the swingweight will be reduced by 3 points. Add 2 grams of weight to head for each point. 6 grams would be correct. A repair shop will have to add hot melt with tungsten if there is access hole to head. If not, high density lead tape to bottom of head will correct. the tape should be applied directly to center of club face bottom. you can experiment position of tape forward or back to adjust ball flight. This will slightly lower center of gravity of club head, small amount. good luck, the ball will rocket off the face with that extra weight.