IIRC, all the Bulgarian 74s were 2 rivet feed ramps. My AKSU (built from a 105) is a 2 rivet feedramp.
Went through my photobucket account and it seems that if it wasn't a SAIGA that I converted I never took pics of the bullet guide.
Anyway, I'll stick with what I said above until someone else chimes in and tells me I'm wrong.
As for it being a real Russian rifle remarked, no clue. Suppose it's possible, although on mine the trunnion is marked pretty deep and it doesn't look like it was scrubbed at one time.