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Number 5 plug smashed... I don't think the number 5 piston is going to be in good shape. It's hopefully just a dropped valve and the piston got stopped. Problem is that when a valve drops and it's able to stop the piston from traveling upwards, there's a lot of side load and the piston skirts can get really ****ed up. I hope that's not your case.
As for heads, Jegs aluminum, Canfield, any big aluminum head is good. Don't spend too much since you are running nitrous. Jegs seem the best bang for the buck. If it were a super/turbo/n/a engine I'd say get some 18 degree heads or the raised runner AFRs. Trick Flow also has some excellent heads for the sbc.
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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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