Somebody refresh me -- who typically did the NAPCO upfits? The vehicle owner? the dealership? a third party?
Hmmm ... interesting. It might be difficult, but I wonder if there are any *other* 55.1 series trucks with NAPCO conversions that show a similar configuration?
Could be a number of reasons -- any evidence to suggest the hood had been repainted to match the rest of the truck?
Another possibility ... the 55.1 series hood badge is taller than the earlier ones. Perhaps it pushed the NAPCO badge too far up on the curve to where it wouldn't lay flat, so they (whoever did the mod) used the earlier/shorter one ?