No major ASW weapon for Project 33? Seems like a bad omission for a large ASW ship. Maybe a system like RPK-1 could share rails and magazines with SAN-1 the way Terrier shared with ASROC?
Of course, those are already not large magazines.
They were converted just prior the introduction of the Purga ASW missile system. Like mentioned the somewhat clumbersome launchers of the M-1 SAM system prevented other type of missiles carried onboard, universal launchers were only adopted in Novgorod during the 70-80's with introducing the Kvant/Kolibri system.