All of your bolts ons are good usable things so building a little more hp with what you have is not a real big deal. I would pull the cylinders off and send them off to a site sponsor andhave them ported. 45 with the stuff you have is a little low it should be closer to 55 but it all depends on the dyno also. A good stock cylinder stock stroke ported motor will make any where for 65 to 70hp so that would be a greta upgrade for you and is not going to change your fuel usage by a large amount. I personally use Redline racing and they do awesome work and have great customer service but any of the site sponsors will hook you up with some good port work. Welcome and enjoy the site.