Engine Fire

I was driving down the road two days ago when my engine shut off. I thought it was something small, so I tried to start it again. I get out and see smoke coming from the hood. I put up the hood and see my engine is on fire. The only thing I see is a hose from someones house. I end up putting it out, of which I'm told not to use water b/c it will spread. But I can't sit there and watch my truck burn to the ground.......Rebuilt motor w/ all new pumps, starter alternator. Edelbrock: intake, carb, and heads. When I finally get it towed home I see my spark plug wires are where I think it all started from. Now I have the task of cleaning and finding if it might be something else....Any suggestions??