Instead of using a Ford starter relay , which has no neutral safety terminal, use a Jeep relay . It looks like a Ford relay but it has an extra terminal for the neutral switch . You can get it at NAPA , Echlin # ST-83 .
As far as the starter shorting out, run a strap across the terminals on the starter , then run a cable to the ST-83 . This way the starter cable is only "hot" when the starter is engaged .
I run this setup on my '65 Belvedere .
'65 Belvedere II - 446-Indy,727 transbrake,Dana 4.56
