Welcome! I have not been a member here very long but the MOPAR knowledge and help is the best, by far. Most questions are answered in detail. Good luck with all your future MOPAR projects.
Have seen date tags that was made and passed tech. Said they were made at print shop then sewed on by hand. It dont hurt to beat the system, when the system sucks!!!!!!!!!!!!LOL
I think I would start out about the same. 416 cubic inch should like more timing on lower end and less on top end. I used a timing retard for high gear (36 to 32 degrees) and picked up about 3 to 4 mph. Motor was 366 cubic inches. By the way the notchback is awsome!