All Plugs Fouling on Right Bank

First chance to work on this problem this week. I changed the right bank of spark plugs, now all eight look clean. Timing set, per RRR's post with vacuum disconnected.
Warmed up the car, still idling rough. The bimetallic choke never fully opened, so I wired it full open. Engine is warm by this point. At various stages, I disconnected and plugged the choke pull off, the pcv hose, the distributor advance hose, and the brake booster hose before the check valve. I was really hoping to find the problem somewhere here, but nothing changed.
When I give the throttle a quick flick, a strong double jet of fuel shoots out, but the engine stumbles.
The engine runs best when the idle adjust screws are full open (rich). But the accelerator pump, when hit, still causes the engine to stumble.
By now, the engine has been idling for about 15 minutes. I pull a few of the spark plugs and they're clean as a whistle, not fouled at all.
To recap, the engine idles rough and bogs when the throttle hits. At this point, I'm thinking about replacing the carb. Thoughts welcome.