ideally you want a -10 feed to the pump, people have had problems with the pump when running a reducer on the inlet. My sump is twin -8, i had enough fittings and line knocking about to run 2 -8 into a Y block that then goes -10 straight onto the pump.
would've been easier to just change the sump fittings but nevermind..lol
on a road car i'd run the walbro into an inline 044, will be more than enough fuel and easy to do