In my opinion I wouldnt waste the money doing a stoke stroke cub, especially since your current topend has low hours on it. I would spend the money on getting the current topend ported, some 33-35mm PWK Carbs, and a set of pipes (if you already have them) which will allow you to see power gains your looking for. I would look to do a 4mill Cub if you going to spend the money going cub, stoke stroke cub aint goin get you much faster. When I had my 4mill Stock cylinder F.A.S.T. Dune port I smoked stoke stroke cubs allday long.