a header panel isn't engine related.... it's body/exterior related.
It's an easy swap and a fairly cheap piece to buy. It's what the grille and headlights attach to. 4 or 8 bolts(can't remember) and it's outta there.
If it needs a header panel, it's likely that it needs a grille and headlights and corners....maybe fenders.
'01 XLT disguised as a '03 Fx4 Level II.