If you're gonna take it all apart to port it, you might as well do a full tear down and do a +4mil stroker crank. Get the crank porting and through a site sponsor who is a shop so it can be welded. A trail port would be a good start. Definitely get a cool head with custom domes made for your specific set up. Whoever ports it should also be able to do the domes. Also, look in to a timing plate. A few degrees or more can net a good gain. You could always upgrade the pipes and carbs down the road.