You can buy -10 90 deg fittings with the rollover valve in em. It’s just a check ball. Drill a hole in the top of the tank, install a bulkhead -10 fitting, then -10 rollover valve, then aluminum hardline in whatever size you want with a loop or two, and straight back down and out the underside of the car.
Make sure you bring it "up high" ----if you are using the stock filler tube you can create a siphon situation through the vent if it is lower than the filler
In fact if you are using the stock filler it might be better to put the vent IN the filler just like the factory.....only larger