416 dyno tuning help

Kid, i hate to be the bearer of bad news, but in my opinion you wont make those numbers in the current configuation. Your A/F numbers show your not lean and while timing advances will help quite a bit, that 470 peak at only 4,200 is not gonna get you there. I'd like to see a dyno curve of your run. 420hp@5800 shows your torque curve is falling off alot on the top end. That's not a charecteristic normally seen with a 4" arm. I'm wondering if the cylinder head/cam combo is working for you. Also, if your only using 1 5/8" headers on the dyno, that's not helping the situation. Hopefully one of the engine builder/dyno guys will chime in.