It also depends what you're willing to live with. I had a 509 cam (advanced a couple degrees) in my old Charger. Low compression 440, 750 Holley, 1 7/8 headers, 4 speed and either 2.76, 4.10 or 4.30 gears depending on what rearend parts were broken at the time. Zippy helped me put it together many years back. It got driven on and off year round, including when it was 20* out. It was a little soggy to drive with the 2.76 gears but other than that it was fine.