dont know if stock converter or not. I dont know current c ratio but want to bolt what ever I need to get as close to 450 hp as I can. What is the cheapest way to go about this.
The good thing is, you have a nice light "A" body.....The bad thing is, you don't know much about what's in it.
The more info you could give the better, but at this point, i'd have to recommend a nice milder NOS kit for what you're looking to do. And i'm not a nitrous guy. :D
If you want to pull it, find out what you have, and do a complete build.....then yes, 425hp is obtainable in a fairly hot street package.
