'68 318 to carbed Magnum 5.2: Check my checklist

Summit sells the proper fitting to go from the carb, to 5/16 flared fuel line.

Buy a 5/16 brake line, they have the fittings on both ends, bend the line over a large diameter piece of pipe.
If you are super cheap and do not have a piece of pipe, you can buy a 1.5" ID PVC coupler for about $1.00 at the local hardware store and make decent bends using it.

Put the fuel filter down by the alternator where the factory did it.