Correct internal or external coil for pertronix points eliminater

Hey guys
I’ve always had points minus a few hei cars. But this is my first Slant and while tuning her up and changing fluids, adjustment etc noticed she had a pertronix points eliminater kit. Since I’m doing cap, rotor, wires, plugs, fluids and already did a carb rebuild as she sat for years what’s the correct coil for this ignition setup? Still has a ballast resistor and if anyone has a economy or OEM part number for a stock or maybe a higher voltage budget minded coil please let me know. Like to change it for peace of mind. It’s a 225 slant post 74 drool tube motor I believe 77 225
Thanks as always
JR