I am going to -8an fuel line and want to use the stock feed as a return. How do you go about doing so with a walbro in the stock location?

does the 5/8" feed rubber line from the walbro to the an fitting cause an issue?

 

If you want to run a -8 line from the tank to the engine bay, you can just weld a
-8 bung to the top of the fuel pump bracket. Just cut off the stock barbed fitting and weld the bung right above the fuel feed hole. I did this in my CRX, with the exception that I used a Bosch 044 inline pump and welded a 1/2" stainless pick-up pipe on to the fuel pump bracket in place of the fuel pump. HTH.

BTW, if you have an EF, I'm selling my -8 set-up, tank to fuel rail.