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Skinny primaries will hurt top end, but help low end torque. The gains made by having custom headers made may not be worth the $ it costs. You can always have bigger headers made later, if you decide you have too much money and not enough HP.
I have seen a chevy with a 632 cid motor running through 1 7/8" primaries, so much torque it couldn't hook up it's big tires in third gear (3 spd auto, manual valve body) from a standing start.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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