It depends on the amount of boost and power you plan on making. I haven't done the fuel system in mine yet, but I did purchase my procharger stuff through Steve Morris who is the procharger guru. I believe he told me to run a -12 with a -10 return but if you gave him your combo there wouldn't be a better person to ask. He sold Steve Morris racing engines and you can find him at New Era Racecraft. Check out his street radial giant caprice wagon running 7.50's at 190+.
http://www.neweraracecraft.com/