I agree with that statement. I decided that since I was a decent engine builder, I would build my own Jr Dragster motors a few year back. I did not realize the close tolerances and severe duty that was placed on the parts. I only had one failed motor in all those years so I can safely say I was successful. One of the things I tried was changing the cam timing to kill the low end and give me better finish line power. My engine part provider said not to do it and he had his cams dialed in to the perfect degree as per his R and D. I used his cam timing for awhile and then went to my experiment. Small changes in a 50 hp 3.5 Rhino make a big difference. After that I had less trouble with tire spin and ran max mph. We were usually the fastest kids at the track. Man I miss those days.
Like I said, the marks are probably ok and just lining them up will be fine. It always pays to check.I kind of get like the mad scientist when I get mics in my hand. It's fun!