Ok I have header air filter govnor removed getting a 265 modified cam. I'm only going to be twisting 4500 at the MOST normal 4100 have a stock carb. Making those rpms with a torque a verter. this is a heavy go kart with big mud tires. Do I need anything besides 18lb springs? What do u guys recommend any cheap good mods? Asking this stuff for my birthday.