Ramshorns or headers?

[3rdGenrationChevyman]

Ive got a stock 307 w/ramshorns, would like to put an exhaust on it to create a little bit of a more aggresive sound,maybe improve my acceleration a wee bit. was wondering... would it be worth it to invest in a set of headers, or would the stock ramshorns be sufficiant? Im not gunna race it or build it into a wildly powerful engine, but a little more pickup & a better,meaner sound would be nice... also Im going to pick up a new carb, was looking at some of the smaller holly`s. which size carb would make sense for my stock smallblock? the carb I have now is pretty rough, Ive rebuilt it but there is still a little hesitation & studdering from a standstill & it jerks at freeway speeds... also the butterfly is pitted up all to heck. I dont want to waste money on a big carb if the rest of the motor wont swing with it. thanks!