ignition coil adapter kits

[donQ]

Many of the part suppliers sell adapter kits that let you convert to a common type coil. The coil offered is used on model "A"s and 49 up flatheads. These applications do not use a coil ballast resistor in series with the coil supply wire. The original coil mounted on the distributor does use a resistor in the supply wire, generally under the dash.
When you convert to the common style coil, do you eliminate the ballast resistor? Does the common style coil have a higher resistance internally to keep the current down?
thanks ,
donQ