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How much gap do you run in the plugs? You can drop down to .025 and see if the car picks up. This will show if the spark is weak, but may not uncover other ignition ills. Have you tried a new ignition, hard wired out side of the old harness? I have seen the old harnesses hide a bad connection problem till a buddy of mine didn't have any hair left.

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OK, checked the voltage at the resistor and at the coil.Did`nt find anything there.
Changed to a Chrome box and a single .5-ohm resistor.
Had an Orange-box with a dual resistor/.08-ohm run side.
Spark plugs are Autolite "powertip" 73`s @ .035
Drove it,can`t say I see any difference except it tries to rattle the valves earlier,so I`m backing down the timing to 29-30* next.