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I had a issue in nuetral with a set of older MSD spiral core wires, they ohm tested well but ran like crap on a new motor, wouldn't idle and a bunch of other symptoms. I had ran those wires on my Duster and replaced them with a new set before selling the car last year, I had a older MSD 7C box on the car, the new car has a MSD 7AL2 box, it is different internally than the older box is so I replaced them with a new set of spiral core Taylors I had in stock and all was good, remember the coil wire fires on every RPM, not every eigth RPM like the spark plug wires carry Ohms is one consideration on determing the abiltity of a conductor to carry a load, conductance, MHO, is another factor as well as impedance That little tiny stainless steel wire wound around the graphite coated nylon main conductor can be misleading on testing

We ditched the MSDs for blue streak 10mm spiral wound last year, they run @ 15 ohms per foot and checked good, the coil wire is a msd that tested low ohms, I also ran ngk 8s non resistor plugs for the first time but have changed back to autolites 3911, Well the springs are pretty close to spec its a little funky getting the pull right on this tester but it looks like 225 lbs is the lightest spring maybe 230.. it depends on which way you hold the handle on the tester & hold your breath, the open pressure is harder to do, this handle could be a little longer for us old guys but its close to 650 lbs with a little shake I pulled the carb and ran a leak down with out the gauge just 135 lb air pressure checkin the intakes and there was no leakage past the seats.... One more piece of info, we sometimes have to use the engine to help stop the truck... major decell from 7k with two feet standing on the brake ... so intake vac may be very high @ that point.... I know its not real good for con rods but its better than wrecking the truck or killing someone, thats one of the main reasons for the super light piston and alu rods.