You don't want to go too big on the cam with a 2800 stall and 3.23 gears... also that 650 carb will be way to small for 496 ci. Although it will have great throttle response.

I don't understand the "pick a cam for sound" mentality. The cam is to make the engine run with the desired power band, not to be a noisemaker! Play engine sounds through the car stereo instead. Believe it or not, some manufacturers actually do this