You might try (Or even when you do the swap) to paint the grill like I t did on my '78 I think the trick that I found that makes it pop is to pull off the metal strips in the middle of the grill and then put them back after it is painted, the contrast is awesome. Of course, nothing beats a 73/74 grill....
I have a set of bumper guards I want to put on mine but can't get to the bumper bolts and I started working back on campers again so I hope to get them on in the next month or so by pulling the bumper off by the frame brackets.