You'll have to develop a new set of polars for your boat's set up..... use the vmg function on your gps to help .... if allowed you could use the gps/vmg in races, saving a lot of work... but I'm uncertain how casual you're racing rules are...and you'd need to have the marks in your database.
Since you're installing a bowsprit also, I would forego attaching the tack to the headstay...get it as far out front as possible, using an adjustable tack line to trim the luff tension.
Regarding deployment..... if you find the spinnaker sock/sleeve somewhat cumbersome during a race, you might change over to the turtle bag method.... you can even have a "take down" line installed on the sail that would make your foredeck crew's job way more simple. In any event... you'll need some one up front, no matter what method you employ, and someone on the halyard. My solution, depending on how experienced the foredeck crew was, or whether I was single handing, was to make sure the spinnaker halyard could be handled at both the mast and the cockpit.... that allows the crew up front to control the sock hoist or drop by himself if need be. That goes the same for the tackline.... where the foredeck crew can release it from a position near the mast making the drop completely under his control. I installed an extra clam cleat on the cabin roof near the tackline exactly for this purpose. If you sail with three or more people this is not as critical, because you'll have a halyard/tackline/sheet person in the cockpit and someone up front to manage the sail up and down.
The main point is that you must really think the process out... know how adept your crew is on the foredeck, especially in bumpy water, and practice the sets and takedowns before you go racing.
Oh, one more thing... try googling "spinnaker deployment systems" there are some creative solutions to getting the asymmetrical set and doused without leaving the cockpit.... very similar in concept to the method used on beach cats.... in which the halyard and takedown control are one continuous line run through a launch tube or sock mounted on the foredeck. Pretty cool.
