The easiest way to do it is to just get the kit that Summit sells. Otherwise, just get any ford style remote solenoid. Then you run a positive cable from the battery to the left terminal on the new solenoid and attach any other wires that need to be constant 12v. You have to take the wire that now actuates your on-starter solenoid and route it to the small terminal on the left side. Then run a battery cable from the right side of the new solenoid to the starter to where the old battery cable went. At the same time, you need to rig up a jumper from that cable to the solenoid terminal on the starter so the starter will engage the flexplate/flywheel. Thats about all there is to it. I recommend getting 0 or 1 gauge battery cables for the entire setup since you're changing things around anyway. You should be able to get some good ones at Napa or Pep Boys. Thats about all there is to it.
73K-5: TBI350/TH-400/NP-203/14FF/D44
Topless, doorless and no tailgate!
Fresno, CA