Well reading his ad he obviously had a number of e-mails. I know a bit about this topic. I once read on PY forum that no 1973 Grand Ams left the factory with the NASA hood at all but I can not confirm that. The hood was standard on the 1973 GTO optioned LeMans and optional on all other LeMans and Grand Am cars. I have posted a couple before on documented LeMans Safari wagons, very neat. Cowl vents are 1973 and 74 production, sometime during 74 this was eliminated. All service replacement hoods no matter what year acquired are date stamped 1973 and have no cowl vents. Huge debate on proper name and there is a thread on here about this. All GM Canada literature refers to these scooped hoods as NASA type. Another huge debate on whether scoop inserts are body colour or matt black. Oshawa production is matt black, US are body colour and matt black so it depended on where the car originated from.