You have alot of leeway on how much (or how little) ballast (ohms) you can get by with and you can wire ballasts in parallel to lower the ohm value to get it where you want it as the device downstream from the ballast combo only sees the end result of the total current from both that gets thru. Use a pair of female terminal "dual" plug ins from a 4 terminal (dual) white bakelite ballast 70's setup and add another blue loop on the other end and (2) 2 terminal "single" ballasts of your choice will fit side by side in the 2 "dual" connectors. A blue loop on each end & 1 wire in and 1 wire out & mix & match ballast combo's till you get the right ohm combo on the meter you are after. As said 1.25 is the nominal ballast amount with the orange box which I believe is with the recommended coil and some coils like the blaster 2 you'd want less like .7 or so & no ballast with MSD as evidently the multiple (quicker) firings stresses (overheats) the coil less