Removeing cats makes the exhaust louder, it does not quiet down the intake. The reason you carb made that wonderfull sound was the size of the secondaries, think of it like the pipes on a pipe organ, they make noise by air blowing across them, the little ones make higher sounds and the bigger ones make bigger lower sounds. If you really want to here that sound get a thermoquad, they have the biggest secondaries and run an open style air cleaner. As a bonus you will get better MPG with a t-quad than a holley.