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You may want to check out the relatively new MERIT-DEM, which is mostly SRTM but heavily corrected (especially north of 60 degrees). You can download it in tiles. They also have corresponding hydrologic models (MERIT-Hydro) that include flow directions, flow accumulations, channel widths, height above nearest drainage, and a depression-filled DEM. All global....
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You can download a 90-m resolution DEM from http://srtm.csi.cgiar.org/download. It covers both Uruguay and all of South America.
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Just found this query and realized I'm trying to do the same thing but going back to 1970.
In case you didn't find it yet, the Missouri Census Data Center's Geocorr application has already done these intersects and provided crosswalks going back through the 1990 census, which should allow you to get this crosswalk post-1982 redistricting.
http://mcdc....
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If you're on linux, try converting .shp files downloaded directly from the census website to geoJSON data using the gdal command line tool. For Debian/Ubuntu that means installing the gdal-bin package, and then running a command like this one:
ogr2ogr -f GeoJSON cb_2018_us_cbsa_20m.json cb_2018_us_cbsa_20m.shp
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