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Keep the A/C unless your going to be a Pure drag car. When it's out outside there nothing worse then sweat dripping from your nose because you wanted to gain 5 to 10 Hp. I have the smog pump and A/C on my car both work. In fact i ran 12.06 With my a/c on last month lol.
you might be able to get by with some underdrive pulleys if you replace the stock alternator with a high output one that can put out lots of amps, but I just don't know for sure. With that big a sound system, you probably need a bigger alternator already!