the crappy sound you may like will make your car run like a dog. the " big " cams are designed to run in the rpm's way up high, like 4500-6500 RPM, give or take, that is just an example, not only that but the bigger cams require more compression, now your 305 has a 9.5:1 compression ratio, if you buy the cam on the end of that list in say a summit magazine ( it would be the biggest cam they offer ) it is going to require somewhere around 12:1 compression for it to run correctly and actully be efficent in the RPM's it is desighned for, shure it would run but it would have no power, specially being you probably have 3.08 gears and would turn 4500 rpm's max on the street, not to mention not enough compression for it to be efficent. on top of that, you have power brakes, and that requires vacume, big cams don't give much vacume at all, you would need a vacume canister or maby even a vacume pump just to run them. Trust me, you don't want the huge cam. with the 9.5:1 compression, you could get a decent sized cam that will gain you a little lope and it will work good, just get a cam that comes in probably no later than 2k, cause it is a daily driver.