As im sitting here trying to 'piece meal' hp items on my charger's original drivetrain (#'s matching 440 and 727) Im starting to think it would just be better to pull the #'s drivetrain, put it in the back storage garage, and just build from scratch the motor/tranny combo Im really wanting. My goal is 600hp or there abouts. Track 25% of the time, 75% of time cruising, although my foot is always in it.

Is there a speed shop (reputable with a good reputation) I could trust to build me a badass big block (larger than 450 cubes) as well as build or get me a nice tranny (auto) to back it up where I could send them my car have them install it, test it, tune it, etc. Does a shop like this exist? If you know of one, let me know, im thinking of just going this route.