Locating the resistor BETWEEN the coil and the condensor increases the value of the "R" in RLC circuit that is the coil primary circuit. And that theortically changes the coil's magnetic field collapse rate and hence output spark energy.
However from a practical standpoint the addition of the ballast resistance (~2 ohms or so) between the coil and condenser doesn't make a signficant reduction in spark output - at least no difference that can be discerned on a slow- reving, low compression tractor engine.
Incidentally I've run 12 volt conversions with the ballast resistor in both possible locations - have never noticed any difference between the two.
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