Are you planning to run the starter current through this relay, or everything else except the starter current?
if not the starter current, something like this would be a good choice.
http://www.ebay.com/itm/6-Volt-Heavy...-/331150582408
If it has to carry the starter current, I think a continuous duty relay is going to cost you lots of $. The Ford or Mopar solenoids that you might be thinking of are not designed for continuous duty and the relay coil will overheat if it is powered up for any extended length of time.
Ray
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