Keep your original fuel pump and rebuild it or have it rebuilt by Then and Now Automotive.
www.then-now-auto.com.New ones are junk from the box and not worth buying. Once your fuel situation and starter/electrical situation is sorted out, your truck spin over fast and start as easily as a modern 12v system.
I've put 10,000+ miles on my truck in the last 3 years with no problems from the rebuilt fuel pump. No auxilliary pump necessary. Once your pump and carburetor are rebuilt, your truck will get all the gas it needs from the mechanical pump.
Make sure you use 00 gauge cables on your battery and that everything is grounded properly and your 6v system will work just fine.
