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I'm still having problems w/ emissions on my 85 (co% double the allowable, plugs read rich also) and started thinking... I've replaced the plugs, wires, o2, checked vacuum as best I could, worked on the cooling system, ran seafoam thru, injector cleaners, etc. etc... and I never checked the distributor cap and rotor.
So, I'm looking at this thing and its sooo tight to the firewall and hood seal, how do you get at those screws in the back?? Whats the trick? Also, is the coil on top of the cap? crazy.
Push back the seal, use looonng handle screwdriver, and leave screws in the cap. Once all are loose pull cap up while pushing the hood seal back to clearthe cap.
I use an old 1/4 flex shaft driver. The same one we used to use in the windows on adjustable point distributers. you can still pick them up at swap meets for next to nothing. It snakes right in.
Is your cat good?? My friend had to go with a 3 wire o2 sensor. he hooked up power and ground and o2 lead and no more problem. no matter what he did his counts showed lean and computer kept adding fuel. May not be your problem, just throwing it out.