Ford Racing's image of the X302 shows it wearing a water pump, which is actually optional and must be purchased separately. The stock Mustang production harmonic damper is included, however. It's the M-6316-M50 part with four pulley mounting bolts and requiring no spacer. Just visible here are the stock block's press-in core plugs; the Boss block uses threaded core plugs. Above all, the X302 is a real value; Latemodel Restoration Supply was advertising them at just $3,299.99 when we went to press.