Wire length shouldn't effect anything. I would recommend you go up 1 size on the wire size, but that is just me. The pickup coax could be a problem. Splicing coax can be kind of tricky. If you move the coil also, you don't want to run the coil wire in the same bundle as the other wires but keep it several inches from any other wiring. It can cross other wires at 90 deg but not parallel to any other wires.

Paul

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84 500 SEL (307,xxx miles)