Voltage verification

[BMJs 67]

I know I've seen it in a post here or at another Ford Truck forum but I can't put a cursor on it right now. The voltage in question is at the coil.
I have a 67 with a 390 in it. The motor is not stock and the PO had done some wonderful wiring modifications at some point. Long story short, I put a Pertrinix in it 4 or 5 months ago. It seems to run well. There is a little hesitation just off idle, not enough to really bug me, but it raises a flag. I put a re-man Holley 2 barrel on it and adjusted the timing but the hesitation is still there. We got to talking about resistor wires and ballast resistors at work and I realized that I never checked voltage at the coil after the mods to the distributor. I checked it tonight, it is running at
11.7 volts idling, with the tester leads at the + side of the coil and a good ground. I think it should be at 14.7? If so, How far back does the resistor wire run from the coil?

[Thunderfoot]

Sorry no one answered this sooner...
The voltage at the coil with the stock resistive wire should be 6-9V... The resistive part of the wire is inside the truck from the ignition switch to the firewall connector. The wire in the engine compartment is not resistive...