Well my 89 calls for 6 degrees BTDC but i timed it to 7 and it runs great there.
thats with the vacuum advance disconnected and plugged. also there is a spring action advance that seems to get neglected on these, as the service manual calls for a drop or two of motor oil down the rotor shaft when replacing the rotor, Lucas rotors are the only ones that work right in my experience, and and neihoff cap, or any brand with the brass terminals the aluminum lucas caps are now made by standard and the aluminum terminal gunks too easily against the brass lucas rotor. as far as a slight mis and stumble i'd suspect a culmination of gunked up stepper motor. next to the fuel press regulator on back of ram housing. clean it and the orifice up and make sure it is working... it controls idle, and you are probably getting a lean mis and a slightly high idle due to the stepper being slightly too opened(too much air) i would also suspect crossing...
there is only one way to route the spark plug wires on these V8's ... i'd take it out into the pitch black some night with a little paint marker. and lift the hood and look for arching, crossing grounding, and mark where it is, then in the daylight use your looms to get the wires in good position and try again
a few attempts should suffice, it helped me. it could also benifit to run either berrymans b-12 chemtool, lucas fuel injector cleaner or seafoam , for a couple tanks . as far as testing that little spring mechanism, you should be able to turn your rotor clockwise a little and it should retrct to its original position, mine was gunked up, and i oiled it and worked it a bunch and BOOYAH she runs like a sewing machine.
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