69 Dart, 340 stroked, 833od? Tremec? 8 3/4 ,3:23

Hey guys new here, I just purchased my first project. First off I am building a 340 stroker to install and my question is if I'll be happy with the 833od or should I save up for the tremec 5 speed. I currently have a 8 3/4 rearend with 3:23 posi in the rear. Using for around town and a couple longer trips.
Also it has a 904 auto, and been looking a conversation kits.
I am sure this has been discussed before but thank you for any input