First off, the AMT and MPC are two completely different kits sharing no parts.
That said, If it's closest to the original MPC annual, it's the SSlasher.
Yea, saying the grille near as good as the original in the last issue of the AMT kit is doing it a kindness ,,, it looks absolutely nothing line any Chevelle grille. Not even the same style.
What it looks like is the grille from a '72 Monte Carlo.