Rob,
i have the feeling that this is a 'trick question'
:-)
there are no longer any Pontiac's running in Winston (Nextel, if you must) Cup.
all the Pontiac teams switched to the Monte Carlo last year, i think.
on Nascar.com they show the team running a Chevy (under 'teams')
but then the picture shows a Grand Prix.
but clicking on the driver's name shows a Chevy.
this die cast ad shows the car as a Chevy
(i think Caliber would know - their stuff is pretty accurate)
http://store.nascar.com/product/index.jsp?productId=1433258
if you click on the "manufacturers" link, they list chevy, ford, dodge & toyota (trucks)
no pontiac.