You can spray however much you want on pump gas. We did it several years at the Pump Gas Drags. However, to spray it hard, you will need to pull a boat load of timing from it, which hurts the power. Having a small cell and spraying race gas helps, but is still a compromise, because the pump gas octane kills the race gas octane and you still have to pull significantly more power.

The best way to set it up is the way we do Drag Week cars. Either two tanks, or one tank with two sides. Say 15 gals of pump gas and a 5 gallon race fuel side. ONE pump. Some simple ball valves in the feeds and on the pump return, allows you to switch from street to race gas with the turn of a couple valves.

As Chip said, the nitrous system needs it own regulator on the fuel side............ALWAYS!!