for input and conversation putting this out there..

68 Barracuda in storage since 1980
looks like it was 'tuned up' about that time

The spark plug wires on the motor looked dusty but new, I picked up a new set of wires from NAPA, compared resistance and got the following,,
all readings with the multi meter on 200u

1980 short wires 4.8 and 4.9
new short wires 5.2 and 5.3

1980 medium wires 5.3 and 5.3
new medium wires 5.4 and 5.4

1980 long wires 5.1 and 5.5
new long wires 6.5 and 6.7

and for the coil wire
the coil wire on the car, did not look as new as the other SP wires 76.4
new coil wire from the kit 5.6
magna core wire, ordered as I moved the coil a couple of inches out,, 2.6

the 1980 wires are labled as
'Belden Premium 7mm high Temperature Cable'

the new set is labled as
'7mm Hign Temperature silicone core and jacket'

from these tests looks like the 1980 set passes more voltage than the new stuff,, with the exception of the MC coil wire,,

not an EE, are the differences significant?

The wires that read lower resistance do not "pass more voltage". www.magnecor.com and www.auroraignitionwires.com both have technical pages well worth reading and any variety you might want of very good quality ignition wire.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

as stated,, not an EE
but I know that
I= V/R

smaller R with a given V means more I,

the older wire has more potential to move voltage

The spark plug wires carry high-frequency AC, not DC or slow AC, so the resistance you measure does not tell you anything about how much spark "voltage they pass". It just plain doesn't work that way.

Go read those two sites I linked; there's a lot of interesting stuff to learn.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

The highest resistance is the spark plug gap..........

Once you have enough voltage to jump the gap, that's as high as the voltage is going to get.

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes