Help! Slant 6 keeps dying

with a plastic gas filter you can see if it is boiling. I know, steel is safer. a routine deal is run a FI hose across the valve cover to car from fuel pump, and ditch the factory steel line as it gets hot how it runs.
timing chain slop????? carb problem? move that fuel line is pretty much stardard for most slant guys now days with this sorry gas.