69 Dart 340 Info Needed

I've owned 340 cars for a long time and my 69 Dart 340 4 speed car since 1987. I have also owned and driven 440 and 383 cars. The 340 Dart is a nice package, light and nimble(can be improved immensely), powerful, and good looking. Throw a hot 440 in a Dart and you have a heavier nose and changes in steering, braking, and of course acceleration.
440 in a B body is a good balance, longer wheel base, heavier, wider...gives it the balance. 44o in a C body...well that provides power and passing acceleration, but it doesn't seem like a powerhouse. HP/Weight ratio.

340's winds up fast(so do 383's)
weigh less(unless you go aluminum parts on the BB)
plenty of parts available still(maybe more than 20 years ago)

I guess I'm partial....my 2 cents