NV3500 in my 74 Duster?

Sorry inkjunkie and everybody else i got my speed all screwed up. I rechecked the rpms at that speed and at (20 mph) its at 3500 rpms and 25 it was at 4100! #-o
Thats understandable demondreamer, I didnt wanna do this swap at first because of those modifications but with some encouragment from my friend and another forum member that did this swap i decided to do it anyway. I was over my head at first but pulled thru and im really happy with it. Its time consuming modifying it in but if you have the patience you reap the benifits and it made a big difference, better gas mileage, engine doesnt scream like hell at highway speeds and the good thing is it costs far less than aftermarket overly priced transmissions, if you have the money to get them then go for it but if your on a budget and want something alittle better than do this swap. I only spent under 350 on everything including the trany, well had to replace the 1st one because it had over 180k miles on it and was already going out, but found another one low mileage 80k miles on it and after 3 years of driving the heck out of it its still running fine! Got all my stuff in phoenix tho at the junkyard, prices probably are different everywhere else. It has its ups and downs just like any other project but im happy with it!