I think your right on each. You should step down 2 between each; tank, pump, regulator to carb. Start with 12an; 10an; 8an. The #8 is right on the return also. I would advise a Magna Fuel pump 500, but BG, Aeromotive, Product Engineering are also good. I like the Magna Fuel 4 port regulator. I usually plug two ports on one side making it easier to run fuel lines to the carb. I also run the filter after the pump but before the regulator, but I think the way you have it will be fine also.