In the late cold war era the SSN-3 shaddocks Did they go through any kind of upgrades to keep them more modern and resistant to jamming than their 1970s versions?
They they also have the problem of poor resolution and not able to pick up smaller ships like corvettes /MGB ?
The P-500 Bazalt (SS-N-12 Sandbox) was the modernised follow-on to the P-5 Shaddock. The USSR didn't bother to modernise the old shaddock carriers like the Kynda or Kresta I classes, and only fitted the new missiles to new combatants like the Kiev and Slava cruisers. P-500 was itself modernised as the Vulcan P-1000 and fitted to 3x Echo II boats and some of the Slavas.
Not sure about P-5/SS-N-3 as its an old design, but P-500 & 1000 had very powerful active radars and would have had no problem picking up a corvette-sized vessel, but given that they were programmed to attack in swarms and to prioritise the large fleet targets, its unlikely they would select a puny corvette over other juicier victims