Er....possible wet blanket but; when you say 300 American Racing cam, is that 300 as in 300 degrees of duration? If so and if it's going in a street car this will be a unhappy mix. Nothing below 4500 rpms and without some kind of close ratio gearbox the car will constantly be falling of the cam every time you up shift. For the road I wouldn't go beyond 275-280 duration and more than 420 lift, this will be tolerable with the stock boxes that drop 3000 rpms between 2nd & 3rd.

Tom