I was hoping someone could help me. I've installed a new Isky cam in my 348, and the new timing gear that goes on the crank has 3 keyways in it. One is for stock, one for advanced , and one for retarded. I put it together on the stock key, and it seems to run hot. Will it help to change it to the advanced keyway? I've heard of theses gears with 3 keys, but have yet to see or hear any explaination of the use of them. Thanks to anyone who can help me. Doug