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Ahh! Carbs! Those were the days.
Darren's right about the headers but what sort of riding do you mostly do? Large diameter headers are great for top end power but the trade off is a loss in low end torque.
Smaller header diameters keep the gas speed up for more torque, while a larger diameter is better for higher RPM. Torque is related to the speed of the mixture passing through the engine, while horsepower is dependant on the volume of mixture that passes through. The quicker the mixture enters and leaves the engine, the more torque it'll make; the greater the volume of mixture that passes through, the more horsepower it'll develop.
So you'll need to decide which setup best suits your riding. I rarely trouble the top end of the rev range, so I won't be going large!
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