Disappointed in my 383 on the Dyno

There are way too many questions and not enough solid answers to provide proper feedback.
Yea I am sorry, I do not have all the specs written down as the previous owner past away shortly after i purchased the vehicle. I can do a compression check on a few of the cylinders to give an idea of what the compression ratio is but aside from that not sure without taking the cam out and heads off know what exactly i have. I am also not against nitrous, but i just fear myself having to fill the bottle often as i tend to get the itch while driving to just give it a go when i make my way to large open roads lol..... I'm essentially a 16 year old trapped inside a 38 year old's body.