1980 C30 SBC (M code) factory exhaust configuration?

[fordguy40]

I apologize if this has been answered, but the search function seems to be broken on my end

Truck currently has a dumped true dual setup with no cats. Our truck appears to have had dual exhaust from the factory because of the riveted-on remnants of the factory tailpipe hangers on both sides of the frame, ahead of the shackles. The truck was first sold in CA to my wife's grandfather, so I'm guessing that means it's not "federal". Checked Walker's site for the factory exhaust layout, but they only list the non-catalytic converter, single exhaust setup.

Could someone please confirm that this truck would have had dual exhaust and a y-pipe going into a single converter? Also, can anyone who's gone true dual/dual cats tell me what kind of grief I'm potentially looking at when I go to smog it?