Talked with Holley/MSD support rep and he says any 6-series ignition box will work to enhance coil voltage to 540v with a multiple of 3 sparks within 20 deg at firing per cylinder and all instructions and wiring comes in kit - NOT needing the #8875 harness, but looks to be much easier connection and more stable over time without creating a big tape ball with electrical tape to hold everything together. Think I'm going to order the MSD 6A ignition box and give it a whirl!
MSD Instructions
Note: Instructions says not to use digital timing lights on tuning motor!
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