The slop in the cam/cam gear fitment can cause rough idle conditions sags hesitations... all kinds of drivabilyt issues. I had to break down and buy the tools since I have been transforming all the 2.7 cars in the area into 3.2 and 3.5 cars. You can eye ball the dots in the back end of the cams and get them all level horizontally and it will run OK (not perfect). The dots on the cam gears basically mean nothing, just get the crank gear dots lined up and the dots on the back end of the cam level and you are in factory specs, sometimes the dots on the cam gear don't line up exactly but it is OK as long as the cam and crank relationship is correct.