I'm converting my 1972 Nova SS to a non-EEC fuel system. I have the new tank and sending unit, sender with supply and return line. My existing pump, also has two outputs. One to the carb and the other for the return. If I do not change the existing fuel pump, will I have issues like fuel system over pressurization with temp increase? Or will i likely create a vacuum in the tank while driving? What quick fixes are out there, and/or whats the best way to go about this? Thanks for all you input, i'm fairly new at all this.