Hemi Swapping a perfectly good 70 Duster

Agree on the RPM feel and sound.. I'm at 3k doing 70 and it doesn't bother me. Drove me batty with the LA. I'll probably do some trans upgrades this winter and honestly, I'm not even sure I'll go with an OD. I just don't care for this lockup 904 (that doesn't lock), so a 727 and a stahl would be a great improvement. Might go through the engine too.. pop some caps, check things over, cam and a tune. Need to add front disc as well. Already have next years Power Tour on the brain. Hindsight stuff and anything to avoid a paint project... Have I mentioned how much I hate paint and body. It's the Devil!!
Could always throw a gear vendors on the 727 later if you change your mind about OD. Those things are kinda spendy though.