Need more info. What kind of riding are you going to be doing? What temp? Any more mods? I would get a adjustable timing plate and put it +4. Who did the port work on the cylinders? They should know best. On my 4 mil dune port stock cylinder bike I had awhile ago with stock carbs, shearers, I had 27.5 pilot. 340 mains 1.5 on air screw stock needle mid clip. That was in the summer. Not sure what you mean by small port