I have a 1987 Z28 with the 305tpi. Lately there's been a noise similar to that of wind howling from under the hood. I think it may be the alternator but not sure. Just today all power was lost in my car, disabling it, sadly. If anyone knows what to look for is somewhat sure what to look for, please contact me. Like I said, it seems like it may be an alternator gone bad due to stress or something else. By the way the battery is only a few months old, and at one point the belt connected to the alternator fan was too tight, warping a pulley.