u will only need to use 1 out let u dont have to run a return line, on the bottom u can run any size line but ide run -8 to a electric fuel pump filter combo the -8 to a regualter under the hood mount it anywhere except firewall i like to mount on strut tower area then run -6 to a fuel log or i run 2 -6's to each end of the carb it its a double pumper style carb,also run fuel system on passanger side
on my cell the vent is -10. I put two 90s and joined them in a tee then ran a hard line threw the trunk pan with a grommet. This is for a car in the trunk, is yours in the bed or under? Ether way I would still vent it safely away from the exhaust.