Help choosing a v8 for my dart

Currently I have the slant 6 225. It runs great and smooth and shifts the same. I want a lot more power, I want the sound of the v8. I was thinking of buying the 1970 318 with the trans, adding a 4 barrel intake and carb and upgrading the cam. Kinda hard to tear into the car when it works so well as is. Here’s what I’m working with, just bought it a few weeks ago

Great looking car. I like your idea with the 318. Get the 273 radiator, exhaust manifolds, and Charger exhaust system. Also see posts # 2 and 5. A & A transmissions may have a way to adapt the newer transmission to your factory shifter.