Saw this old beaut in Chicago this weekend.
Good eye on the bumper. The J4000 did not usually have a rear bumper, or if it did it was the 2 corner pieces, but no center. There are a few white painted step bumpers that were optional too.Hmmm...wrong back bumper, side mirrors and front side marker light?
One problem with swapping to the Rhino chaser grill is the faceplate is different. When the faceplate was actually the front of the car they took care in stamping it so the area around the grill did not wrinkle. On later models, they did just one quick stamp and let the metal wrinkle, changed to the square headlights, and cut away part of the top where the centralized grill would mount. There are also some mounting brackets welded to the faceplate for the modern grill. All these changes are easily hidden by modern grill parts. Finding original face plates in good condition is difficult. They tend to rust out under the turn signals.I don't know J-truck evolution that well, but it's a popular swap to put the earlier "rhino" grill on the later trucks. Just another consideration. Here's a Commander with an interesting photochop. Coulda been cool.