If you have not read this yet, it's worth your time. https://www.fourwheeler.com/how-to/engine/129-0711-1987-2006-jeep-40l-inline-six/#:~:text=Like most modern engines%2C the,is smaller than the stroke.
Chrome, mud flaps, roll bar, lots of chrome lights, brush guard, bed rails, graphics (still working on the right wheels).
I think your front bumper will always make it appear "modern."