From the standpoint of a machine shop that does this regularly, you are making a grave mistake using an old used pickup when new (and original) pickups are available. A used pickup will produce up to a 40% reduction in flow due to the varnish (0.005" in thickness) on the screen. The ONLY time I will even consider using an old pickup, is when a NEW one is not available. I then clean the living crap out of it to remove as much of the varnish as possible. You can currently get the Mancini pickup (A Mopar Original) for a measly $29.07 + shipping. Do yourself a favor and get the new one...…..Thanks .... trying for a nice used first