383 in 68 Dodge Dart? new build

Hi Everyone

I am new to A-Bodies and new to Mopar. I just fell in love with a 1968 Dart and have the dream of restoring it into a nice street ride. I am hoping to meet some fellow Dart owners and get some good advice on my build.

I will be posting pics soon

If I can ask a question to start. I just ran across what I believe is a nice 383 big block and two 727 transmissions that the guy is asking $650 for. (for a motor and two transmissions it seemed like a good deal)

Should I go this route or look for a 340 / 360? I would like to have around 400hp when its all said and done I want to be able to have fun on the street with some real power but not a drag car ifthat makes sense.

The car currently has a 318 but it is not the factory motor.

Again Thanks and I look forward to learning a lot from you guys

Matt