Help please, plug reading wizards!
OK you just said you have the HEI conversion.
Now you need a straight wired e-coil to go with that to give you the hot spark. HEI needs the e-coil, not the old style tower coil like comes stock.
Wired with straight 12 volt, no ballast resistor. Full 12 volts.
Just like these '95 Ford F150 e-coils, they have nice flat spades and clearly marked + and - for easy wiring. They work well with HEI conversions, hot spark.
Local pick and pull for cheep too.