The OregonLive website has a full list of vehicles here.
The New York Times posted a cool story about how they maneuvered these beasts into the museum here.
Finally, the Exhibit homepage is here.
If you're local, or car-crazy enough to make the drive out to Stumptown, you may want to time your visit around one of the free weekend special events that feature specific makes every weekend for the duration of the show.
Cars in the Park is free and will take place Saturdays from 10 a.m. to 5 p.m.
June 18: All Chevrolet
June 25: Italian Cars
July 2: Muscle Cars
July 9: American Vintage
July 16: Hot Rods
July 23: Mercedes & BMW
July 30: All Ford
August 6: Porsche
August 13: All English
August 20: Rod and Custom
August 27: Mopar
September 3: Two-Seaters @Meters
September 10: Green Cars