I have a 96 GTS and after losing the engine last year to a needle bearing I have decided to buy a new engine from SBT. Is there anyway I can go bigger without making any changes? The 587 is a good motor but I would like to have a bit more power. I want to stay with the single carb but I am not sure what my options are. Even if I were to only go to the 657 it would be better. But I don't want to make the change to twin carbs. Can anybody chime in?