Ok then what is the recipe for a 425-450 horse streetable 340

Right now The car runs great. Im working to get it to shift correctly, rebuilding the front end and putting some money in the interior, and thinking of painting it. So as you can see I have my hands full. The paint can wait and probably will have to because I want to get it running how I want it to before that goes down. It has a 8 3/4 rear end with 3.23 sure grip so traction should be ok would be better if I get the spring re-locator. Tires are a little narrow on the rear at 225/70/14. Smokes them with out even trying. Matter of fact the car will get sideways if I let it. But seems to lack what I would like in power at any speed out of first gear. The Hurst ratcheting type shifter works well but in full auto I cant seem to get it to downshift while accelerating.