I would run the .7. Rusty have you ever checked that rig for harness voltage drop, or measured normalized charging voltage?
Couple other things you never hear about
I don't believe in overly long harness leads to/ from the ECU, either for power pickup leads, or the coil NEG wire. And I don't believe in long coil secondary wire, either.
AND everyboy claims the coil + capacitor is "just for radio supression. I do not buy that. The coil + needs a low impedance path to promote strong spark, because when the NEG side of the coil is opened by the points/ ECU, that is when the spark is generated, and the current in that circuit must go all the way back to the battery to ground. I believe that the proper value cap at the coil+ will help that tank circulating current AKA "flywheel effect" of the pulse.
Once, I thought I was wrong, but I was only mistaken