speaking of builder, that's who you should really talk to. whoever is going to port it is going to need to know what kind of ridding, and what kind of power you need, and will need to know all the other mods, and/or suggest what will run best with the porting, including pipes, reeds, carbs, etc, you can get ideas on how the different bolt-ons will perform, but ultimately, the builder will know best how/what will work together best for you.
as for my suggestions, get your head rechambered for the stroke to the size the builder suggests. pro citrcuits will be awesome with a woods/trail port, boysen reeds, and 28-30mm carbs. and, i would also suggest wildcard as my favorite builder, but you should check out the different builders on the site and pick the one you like.