Now I get it. Should have paid attention to the part about clear cover with barb fitting.............
Clear Valve Cover - Hemi Predator 212 - YouTube............
Hemi Clear Valve Cover - GoPowerSports.com.................
You don't have to worry about where to correctly tap off from the valve cover, yours doesn't have a reed valve installed in the underside of it. Your barb fitting has full exposure to the pulsing pressure of each stroke the engine makes. The barb fitting is in the perfect spot for running a pulse pump. The GPS ad shows the fitting being used as an open vent, with a little filter on it to keep stuff out of the engine, but you can put it to a pump fitting, and a vent and/or a catch can instead.
Ideally you would have 2 barbs in your valve cover, very easy to drill that plastic and screw another one into it, but as karl said you can just splice a tee into the existing line to go to 2 places, the pulse pump and the catch can. I say 2 barb fittings because I'm just unsure if sharing a single pulse line between a pump and a freely venting catch can would weaken the pulse. Either way, 2 fittings with 2 lines or a single line with a tee in it, you still end up with 2 lines in the end. Hook one line to the pulse fitting on the pump, and one line to the inlet of the catch can. You get your engine venting from the vent fitting on the catch can.
Here's a video of the ARC instructor explaining the reed valve in the stock valve cover's hemi and non-hemi Predators, and how to properly fit it with a barb fitting. Watch from the 34-min. mark to the 40-min. mark. At the end of that he shows that the vent for the valve cover still must exist...............
Top Plate, Fuel Pump and Pulse Fitting installation(Predator 212, Go kart racing, Mini bike racing) - YouTube