I know there is a difference between the 89 auto & 5spd but what of the other years? the reason why I ask is tomorrow I'm going to be putting a 89 sc auto on to my 91 5spd car and want to know it I need or should swap cams for whatever reason. I know the 89 5spd has a special grind and the auto is the same as the n/a so what should I do?