Another update.

Pulled AIR valve at head, ran pump lots of air, blew compressed air into the head, didn't get any restriction. Pulled ignition coil cover to inspect vac hose that runs from solenoid to air valve. Found plastic vac crushed / broken that leads to air valve. Repaired line.

In the post above, I had tested for vac at the solenoid because I had replaced a bit of rubber hose. The test showed OK because the line was crushed on the solenoid side.

Cleared codes, jumpered the pump , pulled vac on the air valve, watched front O2 go from 0.600 ish to 0.005 very rapidly. Will drive and wait for diag monitors to run.