Srook, Your' concern should be that you have enough wire to go from coil to plug w/out stress. the length of 2ndary wires is moot. I've seen coils relocated inside fairings and as far back as tail pieces. with factory twin feed coil leads differing in length by a foot. most stock era coils use molded in wires and I hesitate to use splicers. while all things fail, plug caps and their connections are the most common. trim as little as is required to insure good contact, extra slack often allows swaping wires from cyl to cyl for dio's. my 2 cents. g