The nominal MP ballast ohms for the orange/chrome boxes is 1.25 ohms but that is with a chrysler coil. Accell told me to use .8 ohms with the super coil, the big yellow beast not the super stock round canister yellow coil you have and I ran it (the SC) 30 yrs ago with NO ballast & it never burned out. I think you could grab any ballasts you have laying around & they'd work fine. You have ALOT of leeway on how little ballast you can get by with and not burn out the coil and likely all of your spare ballasts will have plenty of resistance.