For 1990 data, search Google or the links below. Seems to be a lot of different ways to access, but you might not be able to easily drill down into data from your tracts at this time (until they move the 1990s data over).
A letter dated Nov. 4, 2020
Thank you for contacting the U.S. Census Bureau with your inquiry on data.census.gov.
You can access the [1990s] data through the FTP site at https://www2.census.gov/. Additionally some data are available through the PDFs at https://www.census.gov/prod/www/decennial.html. If you have any questions on accessing this data, please contact firstname.lastname@example.org.