how do you get the proper clearance setting on the cam play(front to back).i have a cam button and i know that will keep the cam from walking out,and i can adjust that clearance buy dinging the timing cover.but i can push my cam back pretty far, to the point where the chain is misalingned a little bit(yes this is a new timing set).what keeps the cam from walking back?do i need the cam plug pushed in more?am i missing something here?thanks again for your help.