Your favorite rear end/final drive ratio and why?

I had 2.94s in my Duster (8 3/4) for years behind a ~450hp 360 and 904 with a cheap loose 2600-rpm stall converter. It was really nice for cruising on the freeway at 75-80 mph but off the line was kind of soggy. Last fall I finally put in 3.55s with fresh sure-grip and it's a much better match with the engine's torque curve. I need to put the 2.94 ring gear on to the spare open diff I have and install that back into my 741 case so I can swap that 3rd-member in if I want to go on a longer highway cruise but for going 65-75 mph the 3.55s aren't bad at all, turns around 3400 rpm which I can take for about 30-45 minutes, maybe an hour max but this car isn't as street-friendly as it used to be.

3.23 or 3.55 gets my vote for best all-around highway-friendly ratios, if your tires are in the 27-28" diameter range. I tried 4.10s once and they sucked on the freeway, 4k rpm was too much for me to handle I was stuck going 55 mph and getting passed by everyone. Engine ran hotter too spinning that fast, at that time I had a milder 360 that ran out of breath at 5k rpm.

I'd personally only bother with 3.9x-4.xx ratios on a more drag-oriented car with an engine that made power well past 6k rpm, and/or with overdrive.