Humm, I would start with headers first. Especially with nitrous. You need to scavenge that exhaust quickly.
Stock stroke?
What is the exhaust duration on the cam?
Maybe a 1.65 rocker can help your combo too.
The thing that you may find is some bottom end is gone and you might rpm higher. But posting a slip will help know where you are on the track.
What rpms are you shifting and trapping at?
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68 Firebird
Are you running with the wind or breaking it?
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