Advantages of a stroker for daily driver

The simplest overdrive conversion for you would be an overdrive 4spd out of a Duster or Aspen, it will also allow you to use your current drive shaft, the only major work with it would be the tunnel.

The 500 (904) overdrive automatic out of a (I think 89-90) Dodge truck that don't need a computer to up shift is a good option, but it will need someone with experience to get it all working properly, you will also have to wire in a shut off switch so it kicks out of overdrive when you hit the brakes or slow down, a cruise control shut off switch, is a cheap alternative, but it needs someone that knows wiring to do it.