Not sure if you said you are using a single line Mallory reg or a return line. If it's only a weekend warrior or drag car the single line is OK. If its a daily driver, I recommend the return style reg. It eases the workload on the pump and will extend its life.
You can buy 1/2" fuel lines from most performance shops coiled up in various lengths. You can unwind it gently and bend your own lines. Be careful not to kink the tubing. You have the option to run aluminium or stainless steel lines. I'm running 1/2" aluminium up and back on a return reg. Then braided line between reg and carb and between the tank pickup and filter. Make sure you run a good filter before the pump to keep crap out of it.
TIP: those AN fittings cost an arm and a leg - especially the 45* and 90* turns!! You can save lost of $$ by using brass tube fittings, rubber hose and clamps (reg to carb).
Own tube bending: need tube bender/tube cutter/flaring tool. You can get most of these for $15 ea.
Here's what my finished project looks like. A little over the top but you may get some ideas.
20 gallon fuel cell. External 45* filler cap. 1/2" aluminium return and vent tubes.
Rear sump pickup. 10AN feed to filter and Mallory Comp 140. 2nd outlet for happy gas!!
Pump/filter close up.
1/2" feed and return lines. 1/2" (8AN) reg to fuel bowls. Small fuel gauge fitted to 3rd reg outlet.