Anyone with access to EPC can run the VIN for the data card which lists the option codes. IIRC the VIN should begin with 107026 for a 5.0 vs 107024 for a ‘common’ 450SLC.

I doubt it’s a factory prepped rally car if it has AC. Aren’t the box and trunk lid supposedly aluminum on real 5.0s? Or many they’re all aluminum. A magnet can confirm that.

Sixto
98 E320s sedan and wagon