I had the 522`s for my new engine. I gave up on them. I couldn`t get them on the heads OUTSIDE of the car. So, I went to the 17/8 tubes. Much easier. Had some pics but can`t find. I do remember the #4 tube covering the #8 spark plug hole/exhaust port.
https://shop.dougsheaders.com/media/...5/d/5/d522.jpg