340/drivetrain build advice

Watching this thread and liking the thoughts and ideas. I too am trying to figure out what to build for my 70 duster. I have a complete steel crank 340 (1972) with 1970 date code X heads on it. It supposedly runs but there is some slop in the bores, so it will be rebuilt. My car came with a 1968 4 speed setup and a 3.23 Sure Grip, so I will probalby keep them intact to save some $$$ for now.

Good luck with your choices!!!