There are probably over one hundred in the area I suggest ...
I think your estimate of 100 is way too low! I'll just name one, near the southwestern corner of your boundaries:
Taqueria Tayahua, on Western just south of 24th St. As you can see in the photo of their wall sign in the linked post, they have tacos and burritos, among other offerings.
Otherwise, I'd recommend going to 18th Street. Between, say, Racine and Damen there must be two dozen places that would fit the bill. Why not try one or two and then tell us what you think?
Taqueria Tayahua
(773) 247-3183
2411 South Western Ave
Chicago, IL 60608
Hours are 8 a.m. to 12 midnight but on Fridays and Saturdays they're open 24 hours.