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If it's not popping up a code and it's falling on it's face from the 60 to the 1/8 mile I'd say it's the tune. The 4.10's and 3000 stall would hide even bad tuning so it's hard to pin point.
320rwhp is pretty good for that combination assuming off the shelf AFR street heads. The other thing is the stock fuel system. I'd say that's your biggest hang up. With stock fuel pump it's hard to believe it's even supporting your 320rwhp! I'd get a walbro 255lph pump. If the injectors are stock than that's also a huge issue. Stock injectors can only flow x amount of hp worth of fuel. They also can't provide enough accel enrichment when it's needed (snap the throttle open fast). Did the dyno tuner even recommend upgrading the injectors and pump? If not, fire him.
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, Jon
Owner of a Red Sled.
If it\'s EFI I can tune it. Specialize in 82-95 GM (yes Lt1\'s)
\"If you can leave black marks on a straight from the time you exit a corner till the time you brake for the next turn.......Then, you have enough horsepower\" - Mark Donohue 
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