Need help tuning Quickfuel carb

I just installed a rebuilt 340 with a large cam and edlebrock heads in a Demon. It to had a misfire at engine speeds. We opened the hood outside the garage at night and saw sparks coming off of the carb secondary linkage. closer look and it looked like a three ring circus of sparks under the hood.

When installing the motor we installed a mechanical advance distributor and a MSD 6AL with a blaster II coil. We used the wires and cap that were originally on the car when it came in.

They were new Taylor wires . we replaced them with MSD wires from my Duster race motor and the miss was gone.

I always liked Taylor wires until I saw this with my own eyes. They cannot handle A hot coil and the multiple spark ignition. I put the Taylor wires on my stock 340 Duster with standard electronic and coil. No problems, No miss.