HRD does the 205 thermostat help mileage or is it an emissions thing? I have always run a 180 stat as I don't like running on the edge of overheating all the time. Atlanta asphalt in the summer sitting in traffic is like an oven.
The hughes cam you found- is it a 9704? That is the current baby roller cam they offer for 318's. IIRC they started similar grinds at number 9701.