If your horsepower numbers will be relatively conservative, a single 3/8" factory style fuel line will suffice. You can run a single line, with -6AN adapters and fittings, thru a Corvette bypass filter/regulator at the rear. This way, you can "dead-head" the system.
If you are running forced induction, or 500hp+ you'll likely require a dual line system with a full return. Dual factory lines, with -6AN fittings can work fine, higher horsepower systems will need to increase fuel line size to flow adequate volume. A good quality bypass regular will be required.
Limiting cloth & braided lines by using metal hardline front to rear will minimize fuel vapors in your garage
