360 or 440 for my 1970 dart daily driver

He said DD
gets good mileage
lots of power
wants to race
and offers 360/440
and he is the smartest, safest 16 yr old around.

Well you better be rich too, cuz the buy-in ain't cheap.
After you get the car,you still need to spend a wheelbarrow full of cash to hit targets like those and still share the road with all us fuddy-duddys.
You need a slanty, 4-wheel disc brakes, and a private acreage. Then you need about 4 years more driving experience.

After that, you need about $12000 to $16000 just to get started. This will get you a nice reliable,hi-torque, pump-gas,360, an O/D tranny and a rear end with big enough tires that the car won't spin out on every turn, with the tiniest bit too much pedal. It will also get you some key suspension pieces to help you be safe, and some decent brakes to stop you when you get into trouble.
And if you do it all just right, you can make 18mpg, or perhaps a little more.

You know slanty cars roll the same as V-8s,right? Maybe they just don't roll as many times.....and they are a wee bit harder to get air with.