Hello guys i am currently in the fuel phase of my build. Along the way ive bought some vibrant 6an pfte rated fuel line 20 ft, some 6an connectors to be able to connect it all. Im going to be putting a rear sump in the gas tank and run the return and feed from there. ISR fuel pressure regulator and z32 fuel filter. My concern is with the stock tank. Does it have to be prepped or modified to be able to hold e85? I really would not want to get a fuel cell made as i like the original look. Btw im also running a walbro 255 in line fuel pump. Thnx in advance for the input