The only carbed 190E was the first gen 2.0 it was later replaced with the 2.0 CIS, the 2.3 and 2.6 were CIS and the 1.8 (Which was the last development in the W201 series) was also CIS
Only the pre '88 2.0's were carburated.
The only carbed 190E was the first gen 2.0 it was later replaced with the 2.0 CIS, the 2.3 and 2.6 were CIS and the 1.8 (Which was the last development in the W201 series) was also CISHis car is not carbed. Only the 1.8's and MAYBE 2.0 where carbed, not to sure on the 2.0
The 2.6 has a CIS Injection system though, which can handle a turbo but very little boost. I think around 5-6 PSI max, which is really nothing, so you should upgrade to EFI if you want to go the turbo route.