You should clip about 3/8" off the end of the HT wire that was in the coil . If it was that loose , I suspect a bit of corrosion there . Also inspect the coil 'screw' that accepts the HT wire for any corrosion .
If the HT wire is resistor type , it should be enough resistance for any system .
But , it shouldn't hurt to try the resistor boot if you usually have good spark .