YOUNG GUN: Putting Nitrous on 318!!!

Hey Guys,
I've decided to put nitrous on my Duster. I figured its cheap horsepower and it can be alot of fun and fairly safe if used correctly. I've been doing alot of research and I'm pretty sure I've covered all my bases. But I figured I would post my setup and let you guess let me know what you think. I'm really just trying to get as much helpful information as possible, because even though I have the knowledge, I lack the experience that you all have.

Here's what I'm running:
74' 318, standard bore, 70k miles,
Stock heads rebuilt with mild machine work (gasket match, valve seats, valve job, bowls cleaned up etc.).
CARTER 625 CARB,
EDELBROCK PERFORMER INTAKE,
HUGHES WHIPLASH CAM .485" INTAKE, .518" EXHAUST; DURATION 213/[email protected].
Headers 1 7/8", to 3" exhaust,
2500 stall, 3.55 suregrip.
Carter hi flow fuel pump (120gph).
Champion factory style spark plugs.
Initial timing @ 12* total 34* all in at 2000.
Compression ratio (calculated) 8.5-8.8:1.
Nitrous Express Mainline kit (100hp).
Standard Mopar electronic ignition with black control box.

My main concerns at this point is what I should set my timing at, I know they say retard 2* for 50 hp, but just wanted to see what people have experienced. I checked my plugs and it looks like I might be a little too advanced. I also want to make sure that my fuel pump is going to be able to keep up because it is only rated at 6.5 psi even though its (120gph). I've also heard some recommend running colder plugs, but I just inspected my plugs and that actually look like they might be too cold as is (heat transfer is only to 1-2 threads at most). Anyways I just really want to make sure there's nothing I'm leaving out or forgetting because I want this to be a good fun learning experience and not a regret later down the road. Any and all advise is greatly appreciated!!!!