Where to buy an electric fan setup?

Have you checked the routing on the fuel line. It seems that most V-8s back in the day had fuel lines that came close to exhaust manifolds and water pumps. Try to insulate line from direct exposure to heat source.

I've modified 2" long, uninsulated, alligator clips to hold an aluminum tube wrapper along parts of a steel fuel line. The idea was to add surface area to improve dissipation. It looks like 3rd world engineering, but it did solve a problem.