The Picco 28 is fairly stout in stock form.....I would caution against modifying the ports of the engine as it is most likely you will end up losing power or creating a very lopsided powerband..without the use of a dyno it would be very difficult to make effective changes that would result in better overall performance, much better to stick to the basics like compression, crank timing and overall sleeve timing... silicone ramping a crank is a bad idea unless your filling an already existing cavity ( some Nova 21 have a back drilled cavity ) .... you cannot push mixture and any shaping you do to the outer wall of the flowpath will only behave like a obstruction and create even more separation of the incoming mixture... Much better to leave the outside radius natural and work on shortening the inside radius , the mixture will follow the shortest path naturally anyways ....