The 35+21 is still a very good buy and worth buying and it is quicker than the Ns21p when fresh and tuned corectly it makes more power and rpm's then the ns21p. All i am trying to say is it's a quick engine looks are very deciving some times. Its well capable of winning club events and even semmi major local events. The 359 is a real step above the paformance of the 35+21. But all up the 359/ns21p package is extreamly good The ns21p gives you the chance to run it during local races and saving the 359 for world, state and country major race meets. Best Regards Jeremy.