the vespa cases are so close that there is no point in putting the time in to port match teh cases.
Your variator has a brass type ring that sticks on. This is a speed restricter it stops your top end and kills low end power. YOu can use a dremel to cut it off real easy than smooth it out.
Other than that get a carb, drill out the intake, and get a pipe do not get a polini, that will allow you to hit 35 maybe 40 if your a small guy.