Wow, you did a fantastic job cutting the frame and making look correct, I see you plated it correctly also. I'm sure it was a PITA but if your like me you would have looked at whats wrong every time you look at the vehicle. It was worth your time to do it. I had a similar thing with my 53 when I did the rear end. I had all my measurements double checked and I had everything perfect according to how the original 53 frame measured. The problem came in where they put the rear end from the factory caused wheels to be too far forward making then un-centered in the rear fender. I never really noticed until after the pickup was painted. My fix wasn't as involved as yours but I did end up moving the rear wheels back 1 1/2 inches.