There's no free lunches with engine building - everything you do affects the engine characteristics in some way. Depending on the cam and how you've timed it in, it might not have great response below 1500 rpm but will really come to life after that. Headers will help in compensating with low down torque. I've wrapped mine in an attempt to keep engine bay temps down and try to aid cylinder charge efficiency (hot gases move faster - faster exhaust gas exit, less effort to fill the cylinder = improved power) It might change fuel efficiency but allows a slightly more aggressive engine tune, I'll have to wait and see on that one. You're doing all the necessary mods to make the most of the carb, it's gonna be a completely different animal when you fire it up