Jay,
For me at least, it would be a case of 'too much info' ...putting more text on the fenders than was originally there.
I might go what Chevy did to get their point across on the '69 Z-28's.
Say in this case 'LS/X' on the grill in the same style as the 'Z-28' badge and '454' on the cowl induction hood in the same style as the 302 numbers or use the original '454' numbers Chevy used.