Fuel pressure regulator plumbing : 850 Demon with a Carter mech. pump

There are regulations by sanctioning bodies that do not allow fuel lines or distribution stuff within so many inches of the flywheel or bellhousing area. It's a safety deal should something there let go and come out.
I've found it best to mount the regulator on the fenderwell and run lines to the carb/engine. The vibration is much less and the regulators seem to hold the pressure setting better and forever. The return should run parallel to the std fuel feed along the frame/floor, and to keep the pressure readings accurate, should be the same size or larger than the feed side.