ford starter relay

[1968GMC]

I read a while back on here that somone instaled a ford starter relay to clear the wires from tuching the headders. Can somone tell me how t wire this? I have a HEI egnition. I was comming home from work last nite at 2AM when sudenly my starter engaged itself so I pull over to shut the engine off and it wont shut off. You should here that. it sounds like someone is doing a brake stand(at 2AM nice)talk abbout panic. After 2-3 minutes the starter quit(its dead) and now wont start. I'm thinking one of the wires touch one of the headder and f%$&ed all up.