I am about to build up a second motor just to be on the safe side and have most of the parts I need. What I need some opinions on is on the head. I am already replacing the valves, springs, port & polish, etc., but when it comes down to the Cams themselves what do you guys really think about keeping the stock cams on?? I am torn between leaving the cams alone or upgrading to crower or crane street cams. I have read up on most of the posts about the differences but to be honest, it didnt make my decision any easier. I dont want to have an aggressive timing/idle issue but I also want to "bullet proof" the motor as much as possible.