Rear and front back spacing 1968 Charger

[restomodmusclecar]

Need some help, I have a 1968 charger and I need to know what is the best backspace for the deepest lip with stock wheel wells.  I am going to run 19s and 20s.  I understand that some will not agree with my choice in size, just as I don't understand why people insist on rolling stock. However, I don't want to modify my stock wheel wheels (middle ground). It's personal choice, I respect anyone choice as it's their ride and I am asking the same.  I have spent quite a bit of time trying search google, bing, etc and have had no luck and seen some all the debates. Anything you can add would be greatly appreciated. One last detail, I want to ensure the rear will tuck in the wheel well and not hit the inside protrusion.   Thanks for your help.