I know you only want F1 tracks, but here are some Brazilian tracks (You guys already found Interlagos). Jacarepagua already had F1 races, so for the other tracks i'll only post the links.
Jacarepaguá (both the Road and Oval Courses)
F1, CART, MOTOGP,... raced there
I posted the actual Jacarepaguá, but here's how the original F1 circuit was. As you can see, some small changes were made after the oval course was build.