Nitrous on a 340 100 shot

Got the timing dialed back 2 degrees and new spark plugs 2 heat ranges cooler. The 100hp hit was awesome when going wide open at 3000rpm in secound it shredded the tires for a sec and took off like it was in first gear. Well worth the price of admission and my afr gauge was about 12.2 for wide open throttle with and without nitrous. I didn't hear any detonation so maybe ill slowly try to creep the timing back in when im more uses to it. Then maybe I'll have to jet it up for more power!!!