Magnafuel 750 protuner

Hey guys im re-doing my fuel system with an external magnafuel 750/ fuel cell. Im going to run -8 feed to the champion fuel rails (160lb injectors) and a -6 return line. My question is should I feed the pump with a -12 or -10 line. The pump itself has -8 inlet but I know I should prob go bigger than that....
 
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