What is a good FPR to use for -8 lines and e85?

[FattyBoomBatty]

I planned on using the stock feed line for the return, along with the stock return line, I figured that would be plenty. I just took the tank out and measured the stock pick up tube at a little less than 1/2" which is -8. SO, should I still use the stock lines as returns and just adapt up to fit the stock pick up tube, or try and run a 1/2" soft line all the way back? Seems easier and cheaper to do the stock line thing. Right?