I would run a large electric fuel pump such as the MagnaFlow 500 or Aeromotive A2000 with a large port regulator feeding the carb and a smaller one such as a holley 803 feeding the NOS. If you're running two carbs, you could use a BG 4-port, MagnaFlow 4-port, or Aeromotive 4-port pro-stock regulator for the carbs. Unless you're talking about a belt driven pump, stay away from anything mechanical for your combo.