Hello, I'm looking for some suggestions/insight. I have 68 400 engine with 3.90 gears. As far as I know it is stock other than it has been bored .030 over. I am thinking about replacing the cam and I'm debating between an 068 and 041. I'm not building a race car, just looking for a little more performance. Can I even swap out my cam for an 041 or do I have to replace more parts due to the lift? Thanks.