I would do a stand alone fuel cell for the nitrous. Your fuel system should be fine NA but on spray you're going to need alot of fuel especially on E85. It will be more cost effiecent as well. If you don't want to do that. The yes you're going to need to upgrade, 60lb injectors and a BAP won't be enough.
Something like this.
http://www.nitrousoutlet.com/catalog...=24§ion=73