Tearing apart hemi 5.7, machine work worth it?

I don't know why one would want to have a 6-speeds when you have a powerful motor under the hood of a lightweight body?
I get the 'manual-shifting' drift in this, but still... 6 gears to row in during everyday driving... I'm getting tired just thinking about it... :D
Extra gears were pretty much only invented for economy-reasons.

I've got an A518 OD-tranny in my Dart, currently with a lowpowered 318 in front of it, but I will put the 5.7 in the car hopefully somewhere this year with the same transmission. I'm sure the 3+OD gears will be enough for this car.

What I'm actually saying is, you could also just put a 904/518 behind the Hemi for the time being, and save/spend the cash for a 6-sp manual later on time.