the cowl tag will often have the characters of a base model, and the model RPO code will be a couple lines down.
as an example a 1970 Trans Am would have a cowl tag stamping of 22387 (base model Firebird), then two lines below would be the RPO code WS4 - which indicates it was a Trans Am.
I think it was done this way because the cars all started as base models, and as they went down the line became associated with a specific order number.
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.
1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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