I'm not sure what all will be open on Saturday, call first.
All the good salvage yards in my area are long gone, the land is worth more with houses on it. Not a whole lot of Dodges in the remaining junkyards...except 94+ Rams.
If you wanted to kill most of Saturday, you could go to French Lake Auto in Annandale, an hour west of Minneapolis http://www.frenchlakeautoparts.com/
It's huge- 100 acres and 13,000 vehicles. Lots of old stuff, 1900-present.
SharaDon Performance 15775 N Hwy 61 Hugo. Cool place, cool guy. Used car stuff. Need a 833 tranny, Dana 60, a 340, 440 or a 426 Hemi, he probably has one. Last time I was there they were building a 68 Hemi Cuda for Super Stock drag racing.
MAS Racing 2288 University St. Paul. Last time I was there it was racing stuff- MSD, tunnel rams, carbs..
TNT Specialties 9199 Davenport Blaine. Racing parts/fabrication.
Wheeler Racing Engines 10500 Nassau Blaine. Racing engines. Has a inhouse dyno.
Hooze 4x4 1435 147th Ham Lake. New and used 4x4 parts
Off Road Specialties 8858 Xylite Blaine. Never been there but they used to have their own chevy monster truck "USA1"