fuel tank switching valve

Anyone have any ideas where I can locate a fuel tank switching valve that will switch 5/8 or 9/16 fuel line? I cant seem to find any 12V operated valves out there with 6 ports, 4 inputs with two outputs. Im putting it in my 76 Chevy build, it has dual side saddle tanks that I would like to utilize seperately (stock setup).

I looked through McMaster Carr, couldn't find anything 12 volt that would work. If you want to rig up a second battery so that you could have 24 volts, you could rig up some solenoids and have a system for a few hundred dollars...